20:
290:. The graph-theoretical analysis of the simplest such reaction involves an ethyl cation with five substituents which undergoes an automerization. This process is characterized by a 20-vertex or a 10-vertex graph depending whether one carbon atom of ethane is or is not labeled. These graphs constitute the first
262:
was proposed under the name "average distance-based connectivity index"; it is now known as the "Balaban index". Not only is it much less degenerate than all previous TIs, but it allows a simple encoding for the presence of
114:(1970–1999)). In addition, he was the head of the Laboratory of Isotopically Labelled Compounds of the Bucharest Institute of Atomic Physics from 1967 to 1974. In 1963, he was elected as Corresponding Member of the
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He was elected as member of the World
Academy of Theoretical Organic Chemists, Paris in 1983; titular member of the Romanian Academy of Technical Sciences, Bucharest in 1993; titular member of the
125:, Vienna, Austria, in charge with radiopharmaceuticals. From 1995 to 1998, he was acting as Vice President of the Romanian Academy. From 1991 to 2012, he was a tenured professor of chemistry at
150:. This reaction is known as Balaban-Nenitzescu-Praill reaction. Nowadays, Balaban is recognized as a world authority in this field. He wrote the only existing book in this area.
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an essay on how the "Sherlock Holmes principle" (if one eliminates the impossible, then whatever remains, no matter how improbable, must contain the truth) can be implemented by
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66:. His parents (Teodor and Florica Balaban) paid a lot of attention to Balaban's education, strongly encouraging his fascination with chemistry. In 1935 his family moved to
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Proposals made by
Balaban about new possibilities for evaluating the performance of researchers, improving the way citations are used for this purpose (e. g., via the
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He has 800 articles published in peer-reviewed scientific periodicals, and 80 chapters in books edited by other authors. He holds 25 patents. As of 2024, his
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was dedicated to the half-century anniversary for this election. Due to political circumstances, the promotion to titular member occurred only after the
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and accordingly lower stability. Then the first push-pull diarylaminyls were synthesized and shown to have stabilities depending both on electronic and
628:
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332:) included the use of author indexes of widely circulated treatises, or modifying the way one considers the impact factors of journals.
235:). Some of these valence isomers undergo thermal or pohotochemical automerizations. More recently, Balaban edited in 1997 a book titled
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271:. Other new TIs were studied: several TIs based on informational descriptors, and triplet-based indices that result from converting
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Honoring invitations to contribute to special issues of journals dedicated to the philosophy of chemistry, Balaban published in
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One area in which cubic (or trivalent) graphs play a dominant role is the enumeration of annulene valence isomers (CH)
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2007: Distinguished
Achievement Award for Research of the Association of Former Students, Texas A&M University
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in chemistry on April 2, 1959. The topic of his Ph.D. thesis dealt with the restrictions catalyzed by anhydrous
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426:, Chemistry Section (youngest member among the other 12-14 corresponding members). In 2013 a special issue of
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is an even number. With two coauthors, Balaban published in 1986 on this topic a 3-volume monograph (
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2007: Romanian
Academy’s Medal "Costin D. Nenitzescu" for distinguished chemical research results
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214:. The first book about this interdisciplinary field was edited by Balaban and appeared in 1976:
129:. Since 2013, after his retirement, he has continued as Professor Emeritus at this university.
317:+ 1, Balaban published a paper on what was later proved to be the first 10-cage, known as the
306:, Balaban observed relations among the known cages. Having discovered how a cage with smaller
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From 1967 to 1970, he was appointed as a Senior
Research Officer at the Chemistry Division,
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For more than forty years, Balaban held positions at the Chair of
Organic Chemistry of the
146:. He discovered with co-workers a new way of synthesis of pyrylium salts by diacylation of
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syntheses of diamondoid hydrocarbons discovered by
Schleyer proceed via multiple
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164:, followed by dehydration. In addition, he had been exploring new syntheses of
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449:, Dubrovnik, Croatia in 2005. He also belonged to over 15 Editorial Boards.
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34:) is a Romanian chemist who made significant contributions to the fields of
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of the
Division of Chemical Information of the American Chemical Society
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Annulenes, Benzo-, Hetero-, Homo-Derivatives and Their
Valence Isomers
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Annulenes, Benzo-, Hetero-, Homo-Derivatives and Their
Valence Isomers
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In order to explain the extraordinary stability of hydrazyls such as
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325:, as was proved by mathematicians using a lengthy computer search.
179:, Balaban and his co-workers prepared related hydrazyls with lower
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Another experimental research direction involves the synthesis of
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548:"Autobiographical notes - 80 years of age, 68 years of chemistry"
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in which various two- and three-dimensional nets were discussed.
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78:, where he finished high school. Alexandru Balaban enrolled the
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Balaban has been investigating the synthesis and properties of
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Topological Indices and Related Descriptors in QSAR and QSPR,
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Starting from the 10-vertex graph known as the 5-cage or the
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Pyrylium Salts. Syntheses, Reactions and Physical Properties
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Academic staff of the Politehnica University of Bucharest
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American-Romanian Academy of Sciences, Arts and Letters
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In 1963, he was elected as corresponding member of the
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He is the editor or co-editor of 8 books, including:
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He is the author or co-author of 9 books, including:
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Academic Press, 1974; translated into Chinese in 1983
321:. In 1973, he found the unique 11-cage, known as the
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Recipients of the National Order of Faithful Service
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From Chemical Topology to Three-Dimensional Geometry
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From Chemical Topology to Three-Dimensional Geometry
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Balaban also developed new synthesis of oxazoles by
160:catalyzed substitution of aromatic compounds with
70:, where Balaban attended elementary school. After
242:On using an approach similar to that imagined by
447:International Academy of Mathematical Chemistry
254:, and compensating graph-size-increase, a new
8:
519:"Professor Alexandru T. Balaban – A Tribute"
614:Politehnica University of Bucharest alumni
445:, Budapest in 2001; titular member of the
428:International Journal of Chemical Modeling
634:Romanian expatriates in the United States
372:Modeling of Cancer Genesis and Prevention
210:. He is considered as one of pioneers of
474:1966: Romanian Order of Scientific Merit
458:1962: Romanian Academy’s Chemistry Prize
624:Titular members of the Romanian Academy
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383:Chemical Applications of Graph Theory,
343:which allows for instance to find all
546:Balaban, Alexandru (March 24, 2016).
495:, awarded by the President of Romania
216:Chemical Applications of Graph Theory
127:Texas A&M University at Galveston
7:
206:Balaban had a permanent interest in
244:Randić for his connectivity index χ
100:Politehnica University of Bucharest
80:Politehnica University of Bucharest
493:National Order of Faithful Service
395:Science and Technology Management,
123:International Atomic Energy Agency
14:
118:, and in 1990 as Titular Member.
629:Texas A&M University faculty
555:MATCH Commun. Math. Comput. Chem
441:in 1995; honorary member of the
368:, three volumes, CRC Press, 1986
313:was hidden in a cage with girth
82:in 1949, where he was awarded a
177:2,2-diphenyl-1-picryl-hydrazyl
138:Experimental organic chemistry
1:
443:Hungarian Academy of Sciences
486:West University of Timișoara
484:1997: Doctor Honoris Causa,
432:fall of the communist regime
23:Alexandru T. Balaban in 2010
655:
599:Scientists from Timișoara
397:NATO Science Series, 1987
62:, in the western part of
570:publications indexed by
403:Gordon and Breach, 1999.
74:, in 1945 they moved to
54:Early life and education
351:Scientific publications
110:(1961–1966), and
30:(born April 2, 1931 in
609:Mathematical chemistry
362:, Academic Press, 1982
44:mathematical chemistry
24:
347:for a given formula.
341:chemical graph theory
212:chemical graph theory
208:theoretical chemistry
202:Theoretical chemistry
198:as the central atom.
48:chemical graph theory
40:theoretical chemistry
22:
479:Herman Skolnik Award
391:, Plenum Press, 1997
284:Lewis acid-catalyzed
246:, but replacing the
58:Balaban was born in
28:Alexandru T. Balaban
108:associate professor
106:(1956–1960),
104:assistant professor
288:1,2-rearrangements
88:aluminium chloride
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604:Romanian chemists
568:Alexandru Balaban
453:Honors and awards
374:, CRC Press, 1990
256:topological index
194:compounds having
36:organic chemistry
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424:Romanian Academy
345:chemical isomers
277:linear equations
275:into systems of
248:adjacency matrix
181:steric shielding
116:Romanian Academy
16:Romanian chemist
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589:1931 births
531:January 11,
527:: 1–8. 2005
466: [
434:, in 1990.
418:Memberships
269:heteroatoms
170:naphthalene
166:indolizines
583:Categories
506:References
162:azlactones
488:, Romania
76:Petroșani
68:Bucharest
60:Timișoara
32:Timișoara
273:matrices
133:Research
524:Arkivoc
414:is 73.
412:h-index
250:by the
192:chelate
168:and of
148:alkenes
64:Romania
491:2000:
477:1994:
227:where
94:Career
46:, and
551:(PDF)
470:]
308:girth
258:(TI)
196:boron
84:Ph.D.
533:2019
337:Hyle
282:The
155:AlCl
267:or
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468:ro
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315:g
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260:J
229:n
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