Alkyl orthotitanates

Alkyl orthotitanates, Ti(OR)4. Fluka supplies a number of these reagents R , i-C Hj, n C4H9. ... 

Hydroxy esters. The reaction of ketene, a carbonyl compound, and an alkyl orthotitanate at room temperature leads to a 3-hydroxy ester after hydrolysis. Yields are satisfactory when R is primary or secondary, but rather low when R is tertiary. Yields are also low in the case of hindered ketones. 

HYDROXY ESTERS Alkyl orthotitanates. Ethyl a-phenylsulfinylacetate. 

Alkyl isocyanoacetates, 158 Alkyl 4-methylphenyl sulfones, 567 d-Alkyl-a-methylacroleins, 14 Alkyl orthotitanates, 11 2-Alkyl-l-oxo-2-cyclopentenes, 284... 

Furukawa et al. [274] and Natta cl al. [275,276] succeeded independently in the preparation of crystalline polyacetaldehyde by using some organometallic compounds, such as diethylzinc or triethylaluminium, for the low-temperature polymerisation of acetaldehyde. Metal alkyls and metal alkoxides, e.g. aluminium isopropoxide, zinc ethoxide or ethyl orthotitanate, have also polymerised other aldehydes such as propionaldehyde and trichloroacetaldehyde to give crystalline polymers (Table 9.3) [270,275,277], A highly crystalline isotactic polymer has been obtained from the polymerisation of w-butyraldehyde with triethylaluminium or titanium tetrachloride-triethylaluminium (1 3) catalysts. Combinations of metal alkyl, e.g. diethylzinc, with water [278] or amine [279] appeared to give very efficient catalysts for aldehyde polymerisations. 

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