Title: 1-Pentol
CAS Registry Number: 105-29-3
CAS Name: 3-Methyl-2-penten-4-yn-1-ol
Additional Names: 1-hydroxy-3-methyl-2-penten-4-yne
Molecular Formula: C6H8O
Molecular Weight: 96.13
Percent Composition: C 74.97%, H 8.39%, O 16.64%
Literature References: Prepd by allylic rearrangement of methylvinylethynyl carbinol with moderately strong acid at 80°: Oroshnik, J. Am. Chem. Soc. 78, 2651 (1956).
Derivative Type: cis-Form
Additional Names: 1¢-Pentol
Properties: Oily liquid. bp9.4 65°. nD20 1.4820. uv max (ethanol): 223 nm (e 11,000).
Boiling point: bp9.4 65°
Index of refraction: nD20 1.4820
Absorption maximum: uv max (ethanol): 223 nm (e 11,000)
Derivative Type: cis-Form p-nitrobenzoate
Properties: mp 61-62°.
Melting point: mp 61-62°
Derivative Type: trans-Form
Additional Names: 1¢¢-Pentol
Properties: Oily liquid. bp9.4 73°. nD20 1.4934. uv max (ethanol): 224 nm (e 13,100).
Boiling point: bp9.4 73°
Index of refraction: nD20 1.4934
Absorption maximum: uv max (ethanol): 224 nm (e 13,100)
Derivative Type: trans-Form p-nitrobenzoate
Properties: mp 63-64°.
Melting point: mp 63-64°
CAUTION: Both isomers tend to polymerize and will explode when heated above 120° in a sealed bomb tube.
Use: Intermediate in vitamin A synthesis.

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