Reference

a,b-Unsaturated esters using AMS-1B borosilicate crystalline molecular sieve

a,b-Unsaturated esters using AMS-1B borosilicate crystalline molecular sieve. Hagen, Gary P. (Standard Oil Co. (Indiana) , USA). U.S. US 4447641 A 8 May 1984, 7 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C07C067-343. NCL: 560211000. APPLICATION: US 82-401549 26 Jul 1982. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) Me a,b-unsatd. carboxylates are prepd. by treating an acid compd. RCH2CO2R1 (R = H, alkyl, aryl; R1 = H, Me) with dimethylformal (I) [109-87-5] at acid compd.-I mol ratio ~0.5- and ~250-430° in the presence of AMS-1B borosilicate cryst. mol. sieve. Thus, 5.7 mL of a soln. of 1:1 M propionic acid [79-09-4] and I was passed over a bed of 1.00 g mixt. of AMS-1B (H+ form) and Al2O3 at 301°, flow rate 0.108 mL/min, and contact time 2.7 s to give Me propionate [554-12-1] and Me methacrylate [80-62-6] in 64.41 and 10.74% yields, resp., with total selectivity 84.1%.

Synthesis and physicochemical properties of macroreticular isoporous styrene polymers having crosslinks of the diphenylmethane type

Synthesis and physicochemical properties of macroreticular isoporous styrene polymers having crosslinks of the diphenylmethane type. Tsyurupa, M. P.; Lalaev, V. V.; Davankov, V. A. (Inst. Elem. Soedin. im. Nesmeyanova, Moscow, USSR). Acta Polym., 35(6), 451-5 (Russian) 1984. CODEN: ACPODY. DOCUMENT TYPE: Journal CA Section: 37 (Plastics Manufacture and Processing) Macroreticular isoporous polymers were prepd. by crosslinking polystyrene (I) [9003-53-6] with methylal (II) [109-87-5] in the presence of SnCl4 catalyst. Crosslinking of I with II in the presence of 1 mol SnCl4/mol II at 20° for 5 h led to complete consumption of II for the formation of diphenylmethane-type bridges. The crosslinked I had a high swelling degree in solvents and nonsolvents for linear I. The internal sp. surface area of highly crosslinked I was 900 m2/g. The uniformly crosslinked I was used as a sorbent and osmotically stable ion exchanger for water purifn.