The synthesis of the 10-, 11-, 13-, 14- and 16-membered cycloalkadiynes 3a-b, 4a-b, 6a-b, 7a-b, 10a-b and 11a-b containing functional groups either in two propargylic or two homopropargylic positions is described. The key step of the synthetic scheme is the DMPU assisted double alkylation of two terminal alkyne units leading to the carbocycles mentioned above in moderate to good yield via a three step pathway. (C) 1997 Elsevier Science Ltd.
Synthesis and Structure of Functionalized Cyclododecadiynes and -dienes
作者:Christoph Boss、Reinhart Keese
DOI:10.1002/hlca.19960790811
日期:1996.12.11
The cyclododecadiynes 3b–d, 8b–d, and 10b–c with functionalities in two propargylic positions, as well as the monofunctionalized diyne 13b have been prepared from simple open-chain building blocks. In the DMPU ( = N,N'-dimethylpropyleneurea)-assisted ring-closing alkylation of 1,7-diynes, the twelve-membered ring compounds have been prepared in yields of 16–55%. The preparation of the diene-diyne 15
Double [2,3] sigmatropic rearrangements of bis(propargyl sulfenates) to bis(allenic sulfoxides) and of bis(propargyl sulfinates) to bis(allenicsulfones) are shown to be a convenient and effective method for the preparation of conjugated diallene systems bearing two electron withdrawing trihalomethyl sulfoxide or sulfone substituents either on C-1 and C-6, or on C-3 and C-4. Such substituents are further
system has been identified. Appropriate functionalized derivatives, stable even in solution, have been conveniently prepared by tandem double [2,3]-sigmatropicrearrangement of conjugated dipropargylic sulfenates to diallenic disulfoxides and spontaneous cyclization of the latter. Stereochemical aspects are presented.
POLYCYCLOCARBONATE COMPOUNDS AND POLYMERS FORMED THEREFROM
申请人:Valspar Sourcing, Inc.
公开号:US20170096408A1
公开(公告)日:2017-04-06
Polycyclocarbonate compounds and upgraded molecular weight polymers made from such compounds are provided. The polymers have particular utility in coating compositions, especially for use on food and beverage contact substrates that are formed into or will be formed into containers or container components.
Polycyclocarbonate compounds and polymers formed therefrom
申请人:Valspar Sourcing, Inc.
公开号:US10000461B2
公开(公告)日:2018-06-19
Polycyclocarbonate compounds and upgraded molecular weight polymers made from such compounds are provided. The polymers have particular utility in coating compositions, especially for use on food and beverage contact substrates that are formed into or will be formed into containers or container components.