منابع مشابه
SYNTHESIS AND THERMAL REARRANGEMENT OF OXYGEN HETEROCYCLIC SPIRANS
Thermal rearrangement of spirans (14) and (31) yields the xanthones (16,34) and diphenylrnethane (15, 32), respectively. The structure for xanthone (16), isolated from thermolysis, has been established by reduction to xanthene (20) followed by reoxidation to give xanthone (16). Alternatively, methylation of the diphenylmethane (15) followed by heating with selenium dioxide also yields xant...
متن کاملAza-pinacol rearrangement: acid-catalyzed rearrangement of aziridines to imines.
A series of di-, tri-, and tetra-substituted N-tosylaziridines [N-(toluene-p-sulfonyl)aziridines] 1, prepared by aziridination of the corresponding alkenes with N-[(tolyl-p-sulfonyl)imino]phenyliodinane (TsN = IPh), was found to undergo a BF3-catalyzed rearrangement (aza-pinacol rearrangement) under mild conditions to give the corresponding N-tosylimines 2 generally in satisfactory yields.
متن کاملGenome Rearrangement
The difference between genome rearrangement theory and other approaches to comparative genomics, and indeed most other topics in computational molecular biology, is that it is not directly based on macromolecular sequences, either nucleic acids or proteins. Rather like classical genetics, its building blocks are genes, and the structures of interest are chromosomes, abstracted in terms of the l...
متن کاملImmunoglobulin λ Gene Rearrangement Can Precede κ Gene Rearrangement
Immunoglobulin genes are generated during differentiation of B lymphocytes by joining gene segments. A mouse pre-B cell contains a functional immunoglobulin heavy-chain gene, but no light-chain gene. Although there is only one heavy-chain locus, there are two light-chain loci: kappa and lambda. It has been reported that kappa loci in the germ-line configuration are never (in man) or very rarely...
متن کاملMechanistic Studies of Allylsilane Rearrangement
Background: Allylsilanes which possess a siloxy group in the α position have been shown to rearrange under Lewis acid catalysis to afford vinyl silanes (eq 1). To understand this reaction completely, we need to know the exact mechanism by which it occurs. Currently two mechanisms may be postulated for the rearrangement; one involves a concerted pericyclic process and the second involves a stepw...
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ژورنال
عنوان ژورنال: YAKUGAKU ZASSHI
سال: 1962
ISSN: 0031-6903,1347-5231
DOI: 10.1248/yakushi1947.82.4_523