1.4- Butynediol, diacetate

Once again, of alkyl-, acetyl-, carbethoxy-, and alkoxyoxazoles, the last have been found to be the most reactive as azadiens towards dienophiles such as propargaldehyde (ynal), acetylacetylene (ynone), diacetylacetylene (yndione), butynediol diacetal, and acetylenic esters.358 359 The reaction... 

Butanediol. 1,4-Butanediol [110-63-4] tetramethylene glycol, 1,4-butylene glycol, was first prepared in 1890 by acid hydrolysis of N,]S3-dinitro-l,4-butanediamine (117). Other early preparations were by reduction of succinaldehyde (118) or succinic esters (119) and by saponification of the diacetate prepared from 1,4-dihalobutanes (120). Catalytic hydrogenation of butynediol, now the principal commercial route, was first described in 1910 (121). Other processes used for commercial manufacture are described in the section on Manufacture. Physical properties of butanediol are Hsted in Table 2. 

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