Vinyl t-butyl ether

VINYLPOLYTffiRS-VINYLETHERMONOTffiRSANDPOLYTffiRS] (Vol24) t-Butyl vinyl ether [926-02-3]... 

Bis-(2-methoxyethyl) ether, 2549 t 1,3-Butadiene, 1480 t 1,3-Butadiyne, 1385 t 2-Butanol, 1695 t Buten-3-yne, 1423 t Butyl ethyl ether, 2540 t Butyl vinyl ether, 2484 t 2-Chloro-1,3-butadiene, 1451 t Chloroethylene, 0730 t 2-Chloroethyl vinyl ether, 1557... 

Dimethylethoxy)-2-methylpropane, 3072 t Butyl methyl ether, 2010 f tert-Butyl methyl ether, 2011 t Butyl vinyl ether, 2484 t Cyclopropyl methyl ether, 1608 t Diallyl ether, 2431... 

The aza Diels-Alder reactions of a, ff-unsaturated sulfinimines (140) represent a very efficient approach to enantiopure dihydro- and tetrahydropyridines (141) (Scheme 8.34, Table 8.11) for a reasonable reaction rate the 1-aza-l,3-butadiene moiety 140 must carry an electron-withdrawing group at the 3-position [65]. The compounds are accessible in only three steps starting from commercially available substrates. Thus, the enantiopure 1-aza-l,3-butadiene can be prepared from the enantiopure menthyl sulfinate with lithium hexamethyldisilazide followed by addition of acetic acid and an a, -unsaturated aldehyde. The cycloadditions of sulfinimines such as 140 run under mild conditions with high yields and excellent endo-selectivity in most cases when high pressure is applied. In these reactions two endo and two exo transition structures namely syn and anti to the sulfoxide moiety should be discussed. The cycloaddition of 140 and t-butyl vinyl ether was performed under various pressures ranging from 0.2 to 1.2 GPa. 

The structure and stereochemistry of the products of acetone-sensitized photoaddition of 1,3-dimethyluracil to keten diethyl acetal, t-butyl vinyl ether, and vinyl acetate have been elucidated 129 cis- and trans-fustd 8,8-diethoxy-2,4-diazabicyclo[4,2,0]octane-3,5-diones (157) and (158) are obtained in the ratio... 

When diphenylacetylene is used as the alkyne in this reaction, the t-butyl vinyl ether (CH3)2C=CHOC(CH3)3 is the only isolated product this is probably formed by insertion of the carbene into the O—H bond of r-butanol. In the case of phenylacetylene, the only isolated product is (5), the origin of which... 

Table 1 shows the relative concentration of the possible acetal moieties of the PHSVC reaction with various vinyl ethers. Besides the acetal protected OH groups B and C (scheme 3), two different structural units D and E were identified by C-NMR analysis (42), The structural unit E is only observed with t-butyl vinyl ether. However, no aromatic to aromatic intra and inter chain crosslinking (F in scheme 3) was observed in either the PHS or PHSVC system, unless high catalyst concentration or high temperature was used. Not only the type of vinyl ether units influenced the molecular weight but also the amoimt of die vinylcyclohexanol comonomer ratio in PHSCV. 

Poly(vinyl alcohol) is very high in head to tail strucmres, based on NMR data. It shows the presence of only a small amount of adjacent hydroxyl groups. The polymer prepared from amorphous poly(vinyl acetate) is crystalline, because the relatively small size of the hydroxyl groups permits the chains to line-up into crystalline domains. Synthesis of isotactic poly(vinyl alcohol) was reported from isotactic poly(vinyl ethers), like poly(benzyl vinyl ether), poly(t-butyl vinyl ether), poly (trimethylsilyl vinyl ether), and some divinyl compounds. 

In 2011 the same research group described another efficient application of dicarbo Q lic acids 63 in the asymmetric inverse-electron-demand 1,3-dipolar cycloaddition (lED 1,3-DC) of C//-cyclic azomethine imines with t-butyl vinyl ether or vinylogous aza-enamines (synthesized from enals) (Scheme 24.23). This latter reaction, carried out without exclusion of moisture and air, gave cycloadducts regioisomeric to the products observed in the normal-electron-demand 1,3-dipolar cycloaddition (NED 1,3-DC) catalysed by Ti/binolate starting from the enals and for this reason the authors introduced the concept of lED umpolung 1,3-DC. 

CH2CH0C(CH3)3 Reaction of TBO with t-butyl vinyl ether/ DTBP t-butyl vinyl ether EPR/ 223 2.003 H(a) 1.61 2H( ) 1.06 86 Kami... 

Using the reactivity ratios for the various monomeric pairs, the aforesaid assumption was tested for the didonor system consisting of A -vinylphthalimide, (NVPI)-/t-butyl vinyl ether (BVE), and NVPI-o -methylstyrene copolymerization with In both cases, modified Eqs. (35)-(37) failed to describe... 

Poly(T-buty] crotonate) Poly(t-butyl vinyl ether) Poly(ethyl vinyl ether) Poly(isobutyl vinyl ether) Poly(isopropyl vinyl ether)... 

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