SCIENTIFIC ABSTRACT RABKINA, S. A. - RABOCH, J.

• Document Type: CREST
• Collection: Scientific Abstracts
• Document Number (FOIA) /ESDN (CREST): CIA-RDP86-00513R001343820014-5
• Release Decision: RIF
• Original Classification: S
• Document Page Count: 100
• Document Creation Date: January 3, 2017
• Document Release Date: August 1, 2000
• Sequence Number: 14
• Publication Date: December 31, 1967
• Content Type: SCIENTIFIC ABSTRACT

MATOVSKIY,
I.M. ; WiBUNA
lnspe~:tion of therapeutic prophylactic institutions in connection
with their antlepidemic work. Zhur. mikroblol., opid. i Immun. 47
no.8:136-138 Ag 165. (MIRA 18:9)
1. Chelyabinskiy gorodskoy otdel zdravookhraneniya i Chelyabinskaya
gorodskaya sanitarno-epidemiologicheskaya stantsiya.

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~B118JB208
AUTHORS9 Voronkov, M.G. and Rabkinaj S.M9
Studies in the field of alkoxy silaneso
XVI. Reaction of,tetraalkoxy silanes with ketones
Zhurhal obshchey khimii, v. 31, no- 4P.19619 1259 1,265
TEXTs In addition ot their paper (Ref. It ZhOKh., 10, 1955 (060)), and..
considering the available methods of synthesizing aldehyde and.ketone ace-
tals, the authors of t 'he present paper studied the effect of substituting
methyl radicals for.the ethoxy groups in tetraethoxy silane on acet-al
zation. For this purpose, acetone and methyl-ethyl ketone were allowed
to react with methyl ethoxy silanes of the formula
(CH 3)n Si(OC2H 5)4-n(n-1-3). Substitution of me-tthyl groups. for ethoxy groulE
~on the silicon atom,considerably reduced the capability of ethoxy silane�
to acetalize ketones. The diethyl ketal yield in the reaction of methyl-
-ethyl ketone with dimethyl diethoxy sil.ane (n-2) was quite low, whereas
no ketal was formed in the reaction of acetone with trimethyl ethoxy si-
Card 1/6

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Studies in the field of alkoxy B118/B208
lane. As acetals, in general, and ketals in particular, split off alcohol
at elevated temperatures, the synthesized acetals were distilled in the
presence of Na or its alcoholate, the ace-tals otherwise being contaminated
by alcohol and the corresponding %9P ..unsaturated ether. The katals of
cyclahexanone and its derivatives readily split off alcohol during di-
stillation, and are converted to 1-alkoxy cyclohexenes. This ability of
1,1-dialkoxy cyclohexanes easily yields I.-alkoxy cyclohezenes which are
formed immediately from cyclohexanone and tetraalkoxy silanest
\_0 + Si(OR) H+ i! . n OR + I RO) Sio i- nROH.
4 m -2n n) M
4
Synthesis was performed by.simple distillation of a mixture of oyolohexa-
none and the corresponding tetraalkOXY Bilane in the presen ce of H 3PO 4*
This mixture had previously been boiled for 8-14 hr. Nearly all the al-
coholis first distilled off, and immediately afterwards -the reaction pro-,
duct containing some alcohol. It was purifiedby distillation on Nag most
suitably at low pressure. Five 1--alkoxy cyclohexenes were synthesized in
.,Card 216

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S/07Y61/631/604/00.11
Studies in the field of alkoxy ... 31,18 B208
Ithis way with yie.lds betv;ein! 55 and 70% (Table). The presence of a cer-
tain quantity of alcohol in the-reaction,.product,.is'l,mportant in acetali-
zation. It was shown that,the reaction of -I.-straalkoxy silanes with al4--
phatic and alicyclic kei-one's takes-place' in the presence of anhydroue
orthophosphoric-acid as a,catalyst-and in the absence of alcoholaq for-
ming the correspondi .ng ketals. Eight k6taii weie O'biained and identified
~_n'this,way, as well,as the acetal of butyraldehyde. The opinion expressed
~.n.publications. that..,al dehydes.are aceiaiized more easiiy Thai ketone,s may
qnly,be.e'xplai .ned by the. fa,Ict., th~t'kleials'hydrolyFe.Imore,,rapidly than-al-
del~yde acetais?' Yu.'N.' ~latonov is thanked for baking the ans-lyseso
TIhere are .1 figure, 1, tablej and 26 referencess., Soviet-bloc and 121
non Soviet-bloc'.? The 2 r6ferences.to English-language publications read
as followlas .1 Hit'. Carswellq H. Adkinso JG'Ama_dhem.Soc,,9 50, 235.94(-1.928);
0. 1. - Pf e61f ei; ~-."-Actkins,'J.Am.ChemiSo'e.', 53, 1643'(1931)-
ASSOCIATIOR sillk~t6v Akadefiiii nauk SSSR
(.Institu*teof,Silicate Chemistry"of-the Academy of
,--Sciences USSR)~
Mird
-3/6,

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Stiidlei~ -in A-0 fleld of ~alkdxy B,1 A., B/B 2 0 8
~~3UBMITTED g.
-May I 1 9 6b
'Legend to-. il~e Tablei
A)' Compound; (B) - formula; (C) boiling point (pressurle i r, Mir Hgf i
7-empiric6l' formula; (9) 6un5d; (F) calculatedl (G) yield;