Reference

Conversion of dialdehydes into cyclic

Conversion of dialdehydes into cyclic .alpha.-ketols by thiazolium salts: synthesis of cyclic 2-hydroxy-2-enones. Cookson, Richard C.; Lane, Roger M. (Dep. Chem., Univ. Southampton, Southampton, Engl.). J. Chem. Soc. 63064-11-9 and 53263-55-1 which are cas registry numbers are also used here., Chem. Commun., (20), 804-5 (English) 1976. CODEN: JCCCAT. DOCUMENT TYPE: Journal CA Section: 24 (Alicyclic Compounds) Pentanedials and hexanedials were cyclized by 3-benzyl-4-methylthiazolium chloride and NEt3 in MeCN into 2-hydroxycyclopentanones and -hexanones, resp. which were easily oxidized to 2-hydroxy-2-enones. E.g., anhyd. OCH(CH2)3CHO gave 78% 2-hydroxycyclopentanone which with Cu(OAc)2 gave 81% 2-hydroxycyclopent-2-en-1-one. .

Use of crosslinked PVA pervaporation membrane in esterification

Use of crosslinked PVA pervaporation membrane in esterification. Liu, Qinglin; Zhu, Yushan; Chen, Hongfang (Dep. of Chem. Eng., Tianjin Univ., Tianjin 300072, Peop. Rep. China). Gaoxiao Huaxue Gongcheng Xuebao, 11(2), 172-176 (Chinese) 1997 Zhejiang Daxue. CODEN: GHGXEG. ISSN: 1003-9015. DOCUMENT TYPE: Journal CA Section: 38 (Plastics Fabrication and Uses) Section cross-reference(s): 45 Pentanedialdehyde-crosslinked PVA membrane and blend membrane of PVA and poly(acrylic acid) were prepd. and used for pervaporation sepn. of water-EtOH, water-acetic acid (I) , and water-Bu acetate systems. Butanol-I esterification was used as a model system for coupling reaction with sepn. by crosslinked PVA pervaporation. Different reaction parameters, temp., catalyst concn., initial reactant mol. ratios were studied exptl.