A simple alarm to aid in preparative glpc fraction collection

Lustig, Robert S.

doi:10.1021/ed049p760

J. Chem. Educ.

1972

DOI: 10.1021/ed049p760

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A simple alarm to aid in preparative glpc fraction collection

Robert S. Lustig¹

Abstract: A simple alarm that can be adjusted to "sound off" when the recorder pen of a preparative gas chromatograph reaches a preset height above the base line.

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1975

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Condensation of p‐Substituted Benzophenones with Dimethyl Homophthalate

1975

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p‐Methyl‐, p‐methoxy‐, and p‐chlorobenzophenone condense with dimethyl homophthalate in the presence of sodium hydride to give the expected stereoisomeric half‐esters 1 and 2. The (z)‐configuration 2 was favoured in the two former ketones, whereas the (E)‐configuration 1 prevailed in the latter. Configuration was determined by cyclisation of the derived dibasic acids 3 and 4 to the oxo‐indenyl acids 7 and 8, also obtained by the action of aluminium chloride on the anhydrides 5 and 6. Cyclisation of the half‐esters gave the indenyl esters 9 and 10. Structures are supported by i.r., u. v., and n. m. r. spectroscopic evidence. The ratio of isomers is interpreted in terms of the relative ease of ring cleavage of the intermediate δ‐lactones 11 and 12.

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Condensation of p‐Substituted Benzophenones with Dimethyl Homophthalate

1975

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A simple alarm to aid in preparative glpc fraction collection

Abstract: A simple alarm that can be adjusted to "sound off" when the recorder pen of a preparative gas chromatograph reaches a preset height above the base line.

Cited by 1 publication

References 0 publications

Condensation of p‐Substituted Benzophenones with Dimethyl Homophthalate

Condensation of p‐Substituted Benzophenones with Dimethyl Homophthalate

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