Detail of "544-97-8"

Reference

Organometallic chemical vapor deposition of films

Organometallic chemical vapor deposition of films. Cockayne, Brian; Griffiths, Richard John Mostyn; Wright, Peter John (United Kingdom Secretary of State for Defence, London, UK). Eur. Pat. Appl. EP 106537 A2 25 Apr 1984, 13 pp. DESIGNATED STATES: R: DE, FR, NL. (English). (European Patent Organization). CODEN: EPXXDW. CLASS: IC: C23C011-00; H01L021-205; H01L021-365. APPLICATION: EP 83-305383 14 Sep 1983. PRIORITY: GB 82-29830 19 Oct 1982. DOCUMENT TYPE: Patent CA Section: 57 (Ceramics) Thin inorg. films for a wide range of uses, e.g., ZnO, ZnSe, or ZnS, are formed from vapors of an organometallic compd. and a heterocyclic org. compd. incorporating a Group V or VI element by passing over a heated substrate for reaction and deposition of vapors. Thus, ZnS was deposited on a substrate heated to 500° from Me2Zn [544-97-8] and thiophene [110-02-1] flowing at 5 and 50 cm3/min at -10° and 20°, resp., in H2 carrier gas.

Stereochemical aspects of the insertion of the first monomeric unit in the stereospecific polymerization of racemic 1-alkenes

Stereochemical aspects of the insertion of the first monomeric unit in the stereospecific polymerization of racemic 1-alkenes. Sacchi, Maria Carmela; Tritto, Incoronata; Locatelli, Paolo; Ferro, Dino Romano (Ist. Chim. Macromol., CNR, Milan 20133, Italy). Makromol. Chem., Rapid Commun., 5(11), 731-6 (English) 1984. CODEN: MCRCD4. ISSN: 0173-2803. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) The diastereoselectivity of the racemic 3,7-dimethyl-1-octene (I) [4984-01-4] insertion into the Ti-13CH3 bond in polymn. of I over the TiCl3-AlMe3 [75-24-1]-ZnMe2 [544-97-8] catalyst was evaluated from the 13C NMR study of the polymer [27497-65-0]. The extent of diastereoselectivity obsd. for polymn. of I is not as remarkable as it was deduced from optical activity measurements on partially resolved polymer fractions (P. Pino, et al., 1975). The steric repulsion between the substituent R of 1-alkenes and the Cl ligands, sym. bonded to the active Ti, is the force stereochem. controlling the diastereoselectivity, which therefore is a result independent of the intrinsic chirality of the active center. The steric interactions effective in the coordination step are sufficient to account for the diastereoselectivity.