Trans-l-chloro-2-

Thus, in this particular system, reaction in liquid sulfur dioxide at —30°C leads to trans-l-chloro-2-nitrosocyclohexane dimer exclusively. 

Preparation of trans-l-Chloro-2-nitrosocyclohexane Dimer (trans-2,2 -Dichloro-trans-azodioxycyclohexane) in Sulfur Dioxide [15]... 

Sometimes this rigid stereochemical requirement affects the regioselectivity of the E2 reaction of substituted cyclohexanes. Dehydrohalogenation of cis- and trans-l-chloro-2-methylcyclohexane via an E2 mechanism illustrates this phenomenon. 

Methylcyclopropene. 3-Methylcyclopropene (2) was originally prepared in about 2% yield by the reaction of trans- l-chloro-2-butene (1, Aldrich) with sodium amide in THF.1 German chemists2 have increased the yield to about 30% by use of lithium amide in boiling dioxane. A particular advantage of the new procedure is that (2) is formed in high purity (98%). 

Draw the two chair conformations of trans-l-chloro-2-methylcyclo-hexane. Which is more stable ... 

Table 6.4 Experimental and Theoretical Rotational Constants (MHz) for Various Isotopolognes of trans-l-Chloro-2-ilnoroethylene [16]...

Draw structural representations of each of the following molecules (a) trans-l-chloro-2-ethylcyclopropane (b) cis-1-bromo-2-chlorocyclopentane (c) 2-chloro-l,l-diethylcyclopropane (d) frans-2-bromo-3-chloro-l,l-diethylcyclopropane (e) c/s-1,3-dichloro-2,2-dimethylcyclobutane (f) c(s-2-chloro-l,l-difluoro-3-methylcyclopentane. 

For the ds-l-chloro-2-fluoroethylene, an a-deuterium isotope effect (one D) of 0.6 ppm is observed, along with a trans-P-deuterium isotope effect of 0.4 ppm. Looking at the /rau.v-l -chloro-2-fluoroethylcnc system, the a-deuterium isotope effect is 0.5 ppm and the c/s-P-isotope effect is 0.2 ppm. For the 1-chloro-l-fluoroethylene system, trans-P-isotope effect is 0.5 ppm, with the ds-(3-isotope effect being 0.4 ppm. From these results, it appears that trans-deuterium substitution transmits its isotope effect better than ds-deuterium substitution, the same trend as is observed in transmission of coupling constants. 

S-trans)-7-Chloro-2, 4,6-trimethoxy-6 -methylspiro [benxofuran-2(3H>, l -(2) cyclohexene]3,4 -dione... 

Azatricyclo[2.2.1.02,6]hept-7-yl perchlorate, 2368 Chlorine, 2-Chloroalkyl aryl sulfides, Lithium perchlorate, 4020 trans-2-Chlorocyclohexyl perchlorate, 2420 3-Chloro-2-hydroxypropyl perchlorate, 1207 l-Chloro-2-propyl perchlorate, 1206 Ethylene diperchlorate, 0795 Ethyl perchlorate, 0852 1,6-Hexanediyl perchlorate, 2470... 

Chloro-4-nitrosoheptane, 399, 415 1-Chloro-l-nitrosocyclohexane, 399-400 trans-1 -Chloro-2-Nitrosocyclohexane... 

The configuration about double bonds is undoubtedly best specified by the cis-trans notation when there is no ambiguity involved. Unfortunately, many compounds cannot be described adequately by the cis-trans system. Consider, for example, configurational isomers of l-fluoro-l-chloro-2-bromo-2-iodo-... 

For the cz s-l-chloro-2-fluoroethylene, an a-deuterium isotope effect (one D) of 0.6 ppm is observed, along with a trans-P-deuterium isotope effect of 0.4 ppm. Looking at the Zra .v-l-chloro-2-fluoroethylene system, the a-deuterium isotope effect is 0.5 ppm and the cis-fi-isotope... 

Calculations have shown that the rotational barrier of the C-O bond in methanol (1.1 kcal/mol) is significantly lower than the corresponding rotational barrier of methyl hypofluorite (MeOF, 3.7 kcal/mol) or methyl hypochlorite (MeOCl, 3.5 kcal/mol), in which a strong [Pg.19]

Craig, N. C. Piper, L. G. Wheeler, V. L. Thermodynamics of cis-trans isomerizations. II. The l-chloro-2-fluoroethylenes, 1,2-difluoro-cyclopropanes, and related molecules. J. Phys. Chem. 1971, 75, 1453-1460. 

Synthesis of l-chloro-2,8,9-carbagermatrane (221) by trans-metallation reaction of trial-lylamine and GeCLt in the presence of zirconium compounds (equation 59) was reported recently632. Subsequent reactions with organomagnesium or organolithium derivatives lead to l-organyl-2,8,9-carbagermatranes (222) (e.g. R = Bu, Ph, Vin, All). 

ATRC of alkyl 2,2-dichloro-6-heptenoates catalyzed by 3.7-12 mol% Fe[P(OEt)3]3Cl2 provided l-chloro-2-(chloromethyl)cyclopentanecarboxylates in 63-85% yield as a 1.8-5.3 1 trans/cis-diastereomeric mixture (cf. Part 1, Fig. 38 133 >134—137) [112, 113]. Small amounts of 6-endo cyclization products were also detected, but only traces of lactones, if at all. The corresponding free carboxylic acids, such as 52, gave in contrast 66-91% of lactones 53 together with small amounts of 6-endo cyclization product 54 (Fig. 12). Simpler 2-bromo- or 2-chloro-6-heptenoates furnished 48-93% of cyclized products under similar conditions [114]. The cisltrans-selectivity was not high for most acyclic substrates, but lactonization was facile for most cz. v-derivatives under the reaction conditions. 

Z (CH3CH2)20—AICI3 14.4. (a) methoxyethene methyl vinyl ether (b) ethyl isopropyl ether 2-ethoxypropane (c) 2-chloroethyl methyl ether l-chloro-2-methoxyethane (d) 2-ethoxy-2,3-dimethylpen-tane (e) 1,1-dimethoxycyclopentane (f) tran.s-2-methoxycyclohexanol (g) cyclopropyl methyl ether methoxycyclopropane. 14.6. (a) dihy-dropyran (b) 2-chloro-1,4-dioxane (c) 3-isopropylpyran (d) trans-2,3-diethyloxirane or trans-3,4-epoxyhexane (e) 3-bromo-2-ethoxyfuran ... 

Addition of benzenesulfmyl chloride to indene also occurs with trans stereoselectivity giving exclusively trans-1 -chloro-2,3-dihydro-2-phenylsulfinyl-l/Z-indene (4)67. 

Substituted polyacetylenes usually show a softening point in the range of ca. 200 to 400 °C (Table 27). It should be noted that these softening points are higher than those of usual vinyl polymers. Poly(l-chloro-2-phenylacetylene) does not melt but only decomposes (dehydrochlorinate) at high temperature. It is known that polyacetylene isomerizes at 145 °C from cis to trans and undergoes an exothermic reaction at 325 °C, but does not melt below 400 °C during its differential thermal analysis 9S). 

C5H9CI 3-chloro-trans-2-pentene 26423-61-0 156.49 11.795 2 5164 C5H9I trans-l-iodo-2-nrethyl-l-butene 66702-95-2 184.63 I2.OO4I 2... 

P-chlorovinyldichloroarsine. (l-chloro-2-di-chloroarsinoethane dichloro[2-chlorovinyl] arsine chlorovinylarsinedichloride Lewisite). Two isomers, probably cis and trans, are known. CICIfCIIAsCL... 

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