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Oxidation of alcohols on an SnMo catalyst
Abstracts
251
EPOXIDATICN OF 3-CHLOROBUTENE-1 BY TERT-BUTYL HYDROPEROXIDE Ye. M i l ' k h e r t , N e f t e k h i m i y a 29, N o . 5, 693-696, 1989. THE epoxidation of 3-chlorobutene-1 by tert-butyl hydroperoxide was studied. The optimum conditions for the leaction were selected: t = 100°C, 3-chlorobutene-1/tert-butyl hydroperoxide molar ratio 10, relative content of Mo(CO)6 catalyst 10-z-10 -5 Mo/tert-butyl hydroperoxide molar ratio, reaction time 1 hr. Under these conditions, the conversion of tert-butyl hydroperoxide amounted to 96-98 moleg/oo, the selectivity of formation of 3-chloro-l,2-epoxybutane with respect to 3-chlorobutene 16 m o l e ~ , and the yield of 3-chloro-l,2-epoxybutane with respect to hydroperoxide 20 mole~/o. OXIDATION OF HYDROCARBONS BY IODOBENZENE, CATALYSED BY OXOCOMPOUNDS OF CHROMIUM A N D VANADIUM G. B. Shua'pin, A. N . D r u z h i n i n a a n d M. M. K a t s , N e f t e k h i m i y a 29, N o . 5, 697-700, 1989. IN ACETONrrRILE,in the presence of CrO3 or VOC12, iodobenzene slowly oxidizes ethylbenzene to acetophenone and ,t-phenylethyl alcohol, cyclohexane to cyclohexanol, styrene to benzaldehyde, and styrene epoxide to acetophenone. In general, additions of ~-picolinic acid greatly accelerate the accumulation of oxidation products or change the selectivity of the reaction. OXIDATION OF ALCOHOLS ON AN Sn-Mo CATALYST G. O. T u r a s h e v a , A. Ye. Lisovskii a n d K. Yu. A d z h a m o v , N e f t e k h i m i y a 29, N o . 5, 701-706, 1989. THE activity and selectivity of an Sn-Mo catalyst in the oxidation of alcohols (ethanol, isopropanol, see-butanol) depend on the acid-basic properties of its surface. The formation of carbonyl compo ands 9ccurs at basic centres. The acid eentres of the cataly st are responsible for dehydration of the alcohols and their oxidation to acids and carbon dioxide. Treatment of an Sn-Mo catalyst with a potassium hydroperoxide solution leads to an increase in its activity in the oxidation of alcohols to carbonyl compounds. ELECTROPHILIC BROMINATION OF METHYLBENZYLPHENOLS M. V. K u r a s h e v , V. N. P e r c h e n k o , R. Sh. A b u b a k i r o v a n d M. P. F i l a t o v a , Neftek h i m i y a 29, N o . 5, 707-711, 1989. A STUDYwas made of the bromination of ~t-methylbenzylphenols by bromine and N-bromosuecinimide in carbon tetrachloride and methanol at 20-50°C. Bromination of 2,6-di(x-methylbenzyl)- and 2,6-di(ct,~-dimethylbenzyl)phenols in CC14 leads to the formation of the corresponding 4-bromo-2,6-diarylalkylphenols in ~ 1 0 0 K yield. It was found that bromination of 2,4,6-tri(ctmethylbenzyl)- and 2,4,6-tri(~,~-dimethylbenzyl)phenols with excess bromine at 20°-50°C makes it possible to obtain both correspouding 4-bromo-2,6-diarylalkyl- and 2-bromo-4,6-diarylalkylphenols and products of bromination of the substituent. The main direction of bromination of the substituent is the formation of products of conjugative addition of bromine and solvent (methanol).
251
EPOXIDATICN OF 3-CHLOROBUTENE-1 BY TERT-BUTYL HYDROPEROXIDE Ye. M i l ' k h e r t , N e f t e k h i m i y a 29, N o . 5, 693-696, 1989. THE epoxidation of 3-chlorobutene-1 by tert-butyl hydroperoxide was studied. The optimum conditions for the leaction were selected: t = 100°C, 3-chlorobutene-1/tert-butyl hydroperoxide molar ratio 10, relative content of Mo(CO)6 catalyst 10-z-10 -5 Mo/tert-butyl hydroperoxide molar ratio, reaction time 1 hr. Under these conditions, the conversion of tert-butyl hydroperoxide amounted to 96-98 moleg/oo, the selectivity of formation of 3-chloro-l,2-epoxybutane with respect to 3-chlorobutene 16 m o l e ~ , and the yield of 3-chloro-l,2-epoxybutane with respect to hydroperoxide 20 mole~/o. OXIDATION OF HYDROCARBONS BY IODOBENZENE, CATALYSED BY OXOCOMPOUNDS OF CHROMIUM A N D VANADIUM G. B. Shua'pin, A. N . D r u z h i n i n a a n d M. M. K a t s , N e f t e k h i m i y a 29, N o . 5, 697-700, 1989. IN ACETONrrRILE,in the presence of CrO3 or VOC12, iodobenzene slowly oxidizes ethylbenzene to acetophenone and ,t-phenylethyl alcohol, cyclohexane to cyclohexanol, styrene to benzaldehyde, and styrene epoxide to acetophenone. In general, additions of ~-picolinic acid greatly accelerate the accumulation of oxidation products or change the selectivity of the reaction. OXIDATION OF ALCOHOLS ON AN Sn-Mo CATALYST G. O. T u r a s h e v a , A. Ye. Lisovskii a n d K. Yu. A d z h a m o v , N e f t e k h i m i y a 29, N o . 5, 701-706, 1989. THE activity and selectivity of an Sn-Mo catalyst in the oxidation of alcohols (ethanol, isopropanol, see-butanol) depend on the acid-basic properties of its surface. The formation of carbonyl compo ands 9ccurs at basic centres. The acid eentres of the cataly st are responsible for dehydration of the alcohols and their oxidation to acids and carbon dioxide. Treatment of an Sn-Mo catalyst with a potassium hydroperoxide solution leads to an increase in its activity in the oxidation of alcohols to carbonyl compounds. ELECTROPHILIC BROMINATION OF METHYLBENZYLPHENOLS M. V. K u r a s h e v , V. N. P e r c h e n k o , R. Sh. A b u b a k i r o v a n d M. P. F i l a t o v a , Neftek h i m i y a 29, N o . 5, 707-711, 1989. A STUDYwas made of the bromination of ~t-methylbenzylphenols by bromine and N-bromosuecinimide in carbon tetrachloride and methanol at 20-50°C. Bromination of 2,6-di(x-methylbenzyl)- and 2,6-di(ct,~-dimethylbenzyl)phenols in CC14 leads to the formation of the corresponding 4-bromo-2,6-diarylalkylphenols in ~ 1 0 0 K yield. It was found that bromination of 2,4,6-tri(ctmethylbenzyl)- and 2,4,6-tri(~,~-dimethylbenzyl)phenols with excess bromine at 20°-50°C makes it possible to obtain both correspouding 4-bromo-2,6-diarylalkyl- and 2-bromo-4,6-diarylalkylphenols and products of bromination of the substituent. The main direction of bromination of the substituent is the formation of products of conjugative addition of bromine and solvent (methanol).