Polarizing, photochromic devices and methods of making the same
申请人:Kumar Anil
公开号:US20070053050A1
公开(公告)日:2007-03-08
A method of making an optical element including overmolding an at least partial coating of an at least partially ordered liquid crystal material and at least one at least partially aligned photochromic-dichroic compound on at least a portion of an optical substrate.
Bromine-Induced Facile Synthesis of Butenolides and Spirobutenolides from Sterically Congested Tetrasubstituted Dialkyl Alkylidene Succinates
作者:Narshinha Argade、Ramesh Patel
DOI:10.1055/s-0029-1219233
日期:2010.4
Starting from sterically congested tetrasubstituted dialkyl alkylidene succinates, facile general approach to several dialkyl substituted butenolides and spirobutenolides with the generation of quaternary carbon center has been demonstrated via bromine-induced dealkylative regioselective intramolecular cyclization and dehydrobromination pathway. The mechanistic aspects involved in the formation of butenolides have been also described in brief.
Regio- and stereoselective selenium dioxide allylic oxidation of (E)-dialkyl alkylidenesuccinates to (Z)-allylic alcohols: Synthesis of natural and unnatural butenolides
作者:Ramesh M. Patel、Vedavati G. Puranik、Narshinha P. Argade
DOI:10.1039/c1ob05709j
日期:——
allylic alcohol formation of dialkyl alkylidenesuccinates has been demonstrated to accomplish one-stepsyntheses of several essential butenolides and fused butenolidesvia an unusual E- to Z- carbon–carbon double bond isomerisation followed by the lactonization pathway. The observed regio- and stereoselective SeO2 allylic oxidation protocol has also been extended to the diastereoselective total synthesis