Reference

Polymerization of methyl methacrylate initiated with organic hydroperoxide-amine systems

Polymerization of methyl methacrylate initiated with organic hydroperoxide-amine systems. Qiu, Kunyuan; Guo, Xinqiu; Wang, Xianlun; Feng, Xinde (Dep. Chem., Beijing Univ., Beijing, Peop.Chemicals with cas numbers 99-97-8 and 80-15-9 also play role. Rep. China). Gaodeng Xuexiao Huaxue Xuebao, 5(2), 238-44 (Chinese) 1984. CODEN: KTHPDM. ISSN: 0251-0790. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Radical polymn. of Me methacrylate [80-62-6] initiated with org. hydroperoxides such as tert-Bu hydroperoxide (I) [75-91-2] and cumene hydroperoxide (II) [80-15-9] and arom. tertiary amines such as N,N-dimethylaniline (III) [121-69-7], N,N-dimethyl-p-toluidine [99-97-8], p-nitro-N,N-dimethylaniline [100-23-2], and p-dimethylaminobenzaldehyde [100-10-7] were investigated. The different amine structures showed little effect on the polymn. rates both in I-amine and II-amine systems. The overall activation energy of polymn. initiated with I-amine and II-amine systems were 50-57 kJ/mol and 39-62 kJ/mol, resp. A mechanism of polymn. initiated with I-III was proposed. .

Mesoionic compounds with a bridging nitrogen atom

Mesoionic compounds with a bridging nitrogen atom. 9. Imidazo[1,2-c]thiazoles. Mikitenko, E. K.; Romanov, N. N. (Inst. Org. Khim., Kiev 252660, USSR). Khim. 89550-87-8 and 87422-99-9 which are cas registry numbers are also used here. Geterotsikl. Soedin., (1), 36-9 (Russian) 1984. CODEN: KGSSAQ. ISSN: 0453-8234. DOCUMENT TYPE: Journal CA Section: 41 (Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers) Section cross-reference(s): 28 Reaction of I (R = Me, Ph) with 3-ethylrhodamine [7648-01-3] gives the expected nulmethinemerocyanine by displacement of the SMe group, but condensation with 3-ethyl-2-methylbenzothiazolium p-toluenesulfonate [14933-76-7] gave meso-ionic compds. II, which could be reversibly protonated to the resp. monomethinecyanines. II absorb at higher (by 42-46 nm) wavelength than the II.HClO4, but III [89550-90-3], formed by reaction of I (R = H) [85604-03-1] with 4-Me2NC6H4CHO [100-10-7] followed by basification, absorbs at lower wavelength (by 52 nm) than its protonated form. Acetylation of I (R = H) by Ac2O in the presence of Et3N occurs at positions 1 and 3 to give a meso-ionic structure, the NMR of which indicated that rotation of the 7-Ph group was restricted. .