Detail of "403-41-8"

Reference

A sterically bulky cyclic thiourea as an efficient ligand for palladium-catalyzed aerobic oxidation of alcohols

Yang, Min; Yip, Kai-Tai; Pan, Jie-Hui; Chen, Ying-Chun; Zhu, Nian-Yong; Yang, Dan (Department of Chemistry, The University of Hong Kong, Hong Kong, Peop. Rep. China). Synlett, (18), 3057-3060 (English) 2006 Georg Thieme Verlag. CODEN: SYNLES. ISSN: 0936-5214. DOCUMENT TYPE: Journal CA Section: 21 (General Organic Chemistry) 1,3-Bis(2,5-di-tert-butylphenyl)-2-imidazolidinethione was demonstrated as an efficient ligand in palladium-catalyzed oxidn. of alcs. using mol. oxygen as an oxidant. This new catalyst system was applied to a wide variety of substrates such as benzylic alcs. 543-49-7 and 403-41-8 are cas registry numbers of chemicals which are used as reagents here., aliph. secondary alcs., and allylic alcs., producing the corresponding carbonyl compds. in good to excellent yields. .

Mechanisms of elimination reactions

Mechanisms of elimination reactions. XXVII. The reactions of 1-arylethyldimethylsulfonium bromides with sodium ethoxide in ethanol. Roe, F. L., Jr.; Saunders, W. H.Chemical with cas number 403-41-8 also plays role., Jr. (Dep. Chem. 403-41-8 is also in the experiment., Univ. Rochester, Rochester, N. Y., USA). Tetrahedron, 33(13), 1581-5 (English) 1977. CODEN: TETRAB. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) Treatment of RC6H4CH(S+Me2)Me Br- (I) with NaOEt in EtOH at 35° gave four products: RC6H4CH:CH2 (II) by E2 and a'-b mechanisms, RC6H4CH(OEt)Me (III) and RC6H4CH(SMe)Me (IV) by the SN2 mechanism, and 1,2-Et(MeSCH2)C6H3R (V) by Sommelet Houser rearrangement (R = H, 4-Me, 4-F, 4-Br, 3-Cl). Isotope effects kH/kD of 5.9 and 3.5 for E2 and a'-b reactions were estd. by comparing the deuterium content of Me2S from b-d3 and a-d7 (all a positions exchanged) sulfonium salts. Anal. of the products from the sulfonium salts were combined with overall rates to calc. partial rates for the formation of each product. These partial rates were fitted to the Hammett equation to give r values for each set of products as follows: II, 0.95 ± 0.19; III, -0.63 ± 0.41; IV, 0.95 ± 0.11; V, 4.84 ± 0.38. ..