Detail of "10471-46-2"

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Polyoxiranes and polythiiranes containing a chiral center in the side chain

Polyoxiranes and polythiiranes containing a chiral center in the side chain. 3. Polymerization of (2RS,3S)- and (2R,3S)-1,2-epithio-3-methylpentanes. Goguelin, Michel; Sepulchre, Maurice (Lab. Chim. Macromol., Univ. Pierre et Marie Curie, Paris 75230, Fr.). Makromol. Chem., 186(6), 1213-25 (French) 1985. CODEN: MACEAK. ISSN: 0025-116X. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Different mixts. of (2R,3S)- [70639-24-6] and (2S,3S)-1,2-epithio-3-methylpentane [98303-35-6] were polymd. using anionic (Na), stereoselective (ZnEt2 [557-20-0]-H2O-Cd tartrate [10471-46-2]) and stereoelective [ZnEt2-R(-)-3,3-dimethyl-1,2-butanediol [31612-63-2]] initiator systems. In all cases a preferential consumption of the (2R,3S)-diastereoisomer was obsd. The reactivity ratios of the two isomers (2R,3S) and (2S,3S) in the copolymn., initiated with Na, were r1 = 1,40 ± 0,08 and r2 = 0,54 ± 0,05, resp. A low but significant diastereoisomeric enrichment, obsd. in stereoselective polymn., results from different consumption rates for the two diastereoisomers on enantiomorphic sites of the initiator. The election obtained with a stereoelective system is much higher. It is, however, not very different from that obsd. with isopropylthiiranne, which does not bear an addnl. chiral center in the alkyl substituent.