Detail of "126-54-5"

Reference

Processable rigid polymers containing spiroacetal units

Processable rigid polymers containing spiroacetal units. Lee, Kwang Sup; Rhee, John M.; Choi, Kil Yeong; Kim, Hyun MIn; Lee, Soo Min (Polym. Lab. 2, Korea Res. Inst. Chem. Technol., Taejeon, S. Korea). Front. Polym. Res., [Proc. Int. Conf.], 1st, 529-40. Edited by: Prasad, Paras N.; Nigam, Jai Krishna. Plenum: New York, N. Y. (English) 1991. CODEN: 57ZRAI. DOCUMENT TYPE: Conference CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 36 4,4'-(2,4,8,10-Tetraoxaspiro[5.5]undecane-3,9-diyl)bis[phenol] was prepd., characterized, and polymd. with 2,5-dialkoxyterephthaloyl chlorides (alkoxy = butoxy to hexadecyloxy) to give spiroacetal moiety-contg. polyesters with flexible side groups (PSI-I) and with diacid chlorides (terephthaloyl and tetramethylene to tetradecamethylene) to give polyesters with flexible spacers in the main chains (PSA-II series). Most of the PSA-I series were sol. in THF, DMF, CHCl3, and PhOH/CCl4 indicating improvement of soly. by the flexible side chain introduction. The polymer having butoxy side chains did not show a m.p., but the higher analogs had m.ps. 228°, 224°, 208°, and 182°, resp. In the case of the PSA-II series, the polymers having octamethylene, decamethylene, and tetradecamethylene groups had m.ps. 253°, 220°, and 175°, resp. All of the polyspiroacetals synthesized were relatively stable thermally, with thermal gravimetric curves showing 5% wt. loss at 318-370° under N. X-ray powder patterns (Bragg reflections) indicated that the PSA-I series had considerable crystallinity and that the PSA-II series had some cryst. properties.

Determination of bound formaldehyde in pentaerythritol diformal

Determination of bound formaldehyde in pentaerythritol diformal. Tabachkova, T. P.; Spirina, V. D. (TsNILKhI, Khimki, USSR). Gidroliz. Lesokhim. Prom-st., (7), 17-18 (Russian) 1983. CODEN: GLKPA2. ISSN: 0016-9706. DOCUMENT TYPE: Journal CA Section: 80 (Organic Analytical Chemistry) Bound H2CO was detd. in pentaerythritol diformal by a method involving dissoln. in concd. HCl, boiling with 1% dimedone for 10 min, cooling to lab. temp. for 30 min, filtering off the condensation product, dissolving it in Me2CO, and titrn. with 0.1N KOH vs. phenolphthalein. The anal. time and relative std. deviation were ￡1. 126-54-5 and 50-00-0 which are cas registry numbers of substances are two of reagents here.3 h and 0.012, resp. The results were calcd. taking into account the incomplete hydrolysis of the diformal (92.5%). .