墙壁
发表于 2025-3-26 23:23:52
Carbo- and Hetero-Cyclic Annulation in the Design of Complex Molecules.1,omocrotonate to enones, aldehydes, and some imines, or by a protocol that utilized the intramolecular cycloadditions of diazoketones or azides to 1,3-dienes. The resulting strained 3-membered rings provided, through their energy contents, the necessary driving force for the corresponding rearr
moribund
发表于 2025-3-27 01:41:54
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有恶臭
发表于 2025-3-27 06:51:10
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colostrum
发表于 2025-3-27 10:12:49
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synovitis
发表于 2025-3-27 17:30:47
Chemical Behaviour of Cation Radicals Derived from Strained Molecules in Solution. Spiro-Activationilizing groups in a geminal manner, are highly reactive in the thermal reactions with TCNE or DDQ. The reaction with TCNE produces a five-membered . adduct, whereas the product isolated in the reaction of methyl-substituted substrate with DDQ is a Diels-Alder adduct after ring-cleaving dehydrogenati
危险
发表于 2025-3-27 18:05:21
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Limited
发表于 2025-3-27 22:42:39
Intramolecular Cycloadditons of Ketenes and Olefins,bi- and tricyclic cyclobutanones. The major side reaction, namely the dimerization of the ketene is prevented by the introduction of conformational restrictions. This has been achieved by an additional double bond or by an annulated ring system. Following this strategy C-analogues of a penem and a c
Gossamer
发表于 2025-3-28 02:35:02
The Generation and Rearrangement of 2-Diazocarbonyl Cyclobutanones: The Formation of 5-Spirocyclopr these materials as well as the conjugation extended 5-alkylidene and arylidene derivatives have been reported. In light of this, it is curious that 5-spirocyclopropyl Δ. butenolides are, virtually unknown2 in spite of the fact that they represent a homoconjugated variation of the 5-alkylidene deriv
grieve
发表于 2025-3-28 07:51:35
Cyclobutane-Cyclopentane Interconversion of Coordinated Adducts of Cycloheptatriene and Tetracyanoea 2:3 ratio. The rate constants for the interconversion process in CDC1. were evaluated by the spin saturation transfer technique, and in CD.OD by variable temperature line shape analysis. The rate constant for the 3+ 2 2+ 2 rearrangement in CDC1. k. 0.19 ±0.03 s. with ΔG 18.37 . 0.10 kcal/mol at 24
Plaque
发表于 2025-3-28 12:09:32
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