Infrared properties

The preparation and spectroscopic properties (infrared, ultraviolet, NMR) of iV-alkoxycarbonyl-N -(2-thiazolyl)thioureas (268) have been studied by the Nagano group (78, 264). These compounds react with bromine in acetic acid or chloroform to give 2--alkoxycarbonylimino-thiazolo[3,2-h]thiadiazolines (Scheme 162), whose structures were established by mass spectroscopy, infrared, NMR, and reactivity patterns (481). 

The product has the following spectral properties infrared (chloroform) cm. 1652, 1597 proton magnetic resonance (chloroform-d) 3 1.33, 6.56. 

The product has the following spectral properties infrared (KBr) cm.-1 3103 and 3006 (aromatic C—H), 2955, 2925, and 2830 (aliphatic C—H stretching), 1257 and 1032 (aromatic methyl ether), 841 and 812 (C—H out-of-plane bending of isoxazole C4—H and 4-substituted phenyl) proton magnetic resonance (trifluoroaeetic acid) 5, multiplicity, number of protons, assignment 3.98 (singlet,... 

The checkers found that a fraction, b.p. 45-71° (18 mm.), had the following spectral properties infrared (carbon tetrachloride) no absorption in the 3300-1600 cm.-1 region attributable to OH, C=0, or C=C vibrations proton magnetic resonance (chloroform-d) <5, multiplicity, number of protons, assignment 3.1-4.2 (multiplet, 4, CH—Cl, CH—O, and C//2—O), 1.0-2.5 (multiplet, 7, GH3 and 2 x C//2)-Thin layer chromatographic analysis of this fraction on silica gel plates using chloroform as eluent indicated the presence of a major component (the cis- and fraus-isomers), Rf = 0.60, and a minor unidentified component, Rf = 0.14. 

The preparation methods of aluminum-deficient zeolites are reviewed. These methods are divided in three categories (a) thermal or hydrothermal dealumination (b) chemical dea-lumination and (c) combination of thermal and chemical dealumination. The preparation of aluminum-deficient Y and mordenite zeolites is discussed. The structure and physico-chemical characteristics of aluminum-deficient zeolites are reviewed. Results obtained with some of the more modern methods of investigation are presented. The structure, stability, sorption properties, infrared spectra, acid strength distribution and catalytic properties of these zeolites are discussed. 

Gas chromatographic analysis on a 3.5-m. column packed with Silicone DC 550 and operated at 200° showed that the product was at least 99.5% pure. The product has the following spectral properties infrared (neat) 750 cm-1 (1,2-disubstituted benzene) proton magnetic resonance (carbon tetrachloride) S (multiplicity number of protons, assignment) 7.00 (singlet, 4, aromatic), 2.60 (triplet, 4, benzylic CH2), 1.7-0.7 (multiplet, 14, CH2CH2CH3). 

Braker, W., and A. L. Mossman, 1980, Matheson Gas Data Book, 6th ed., Matheson Div. Searle Medical Producls, Lyndhurst. N.J., 07071. Although this volume does not present methods of purification, it does provide information which is useful in the handling of gases, such as tabulations of physical properties, infrared spectra (sometimes showing impurities which are not identified as such), safety information, and handling instructions. 

Thiazolyl sulfamic acids, rearrangement of sulfonic acid, 70 rearrangement to sulfonic acid, 75 by sulfonation, 75 2-Thiazolyl sulfenyl chloride, transformation to, thiazolyl disulfides. 412 2-Thiazolyl sulfide, in hydrocarbon synthesis, 406 oxidation of, with m-chloroperbenzoic acid, 415 with CrOj, 415 with Hj02,405,415 with KMn04,415 physical properties, infrared, 405 NMR, 404 pKa, 404 ultraviolet, 404 preparation of, from 2-halothiazoles and 5-Thiazolyl sulfides, bis-5-thiazolyl sulfide, oxidation of, 415 general, 418 5-(2-hydroxythiazolyl)phenyl sulfide case, 418 physical properties, 418 preparation of, 417-418 table of compounds, 493-496 uses of. 442 2-Thiazolyl sulfinic acid, decomposition of, 413 preparation of, from 2-acetamidothiazole sulfonyl chloride, 413 from A-4-thiazoline-2-thione and H, 0, 393,413 table of compounds, 472-473 5-Thiazolyl sulfinic add, preparation of,... 

Curtis and Eisenstein have made a molecular orbital analysis of the regioselectivlty of the addition of nucleophiles to 7r-allyl complexes and on the conformation of the rj -allyl ligand in [MoX(CO)2L2(Tj -allyl)] type complexes. A detailed study of the chirality retention in rearrangements of complexes of the type [MX(CO)2(dppe)(Tj -C3H5)] has been made. Studies of the photoelectron spectra, electrochemical properties, infrared spectroelectrochemistry, and fast atom bombardment mass spec-... 

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