Engineering topics
Publications and source records attributed to Djerassi, C..
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Electron-impact induced fragmentations of o-, m-, and p-hydroxyalkylphenones and their trimethylsilyl (TMS) ethers are studied by means of high-resolution mass spectrometry, metastable defocusing, and deuterium labeling of the TMS ether derivatives. A markedly increased methyl radical loss from the o-TMS ether is attributed to a proximity effect. Minor fragmentation was observed with m- and p-isomers. Significantly intense doubly-charged ions were formed from ketonic cleavage and by the loss of a TMS methyl radical. The sequence of fragmentation was found to depend on the size of the alkyl group attached to the ketone carbonyl.
Ion cyclotron resonance application to propanol ion structure formed in double McLafferty rearrangement, demonstrating direct enol ion formation instead of by isomerization or ketonization
Remote group interactions after electron impact in 4-substituted cyclohexanones, investigating mass spectrometry in structural and stereochemical problems
Electron impact promoted phenyl migration of trans phenyloctalone, considering mass spectrometry and stereochemistry
Valeraldehyde o-nitrophenylhydrazone mass spectrum with low intensity peak due to combined hydroxyl and water loss from molecular ion
Synthesized amino esters and ketones with varying distance between functionalities, examining mass spectral fragmentation
Mass spectral properties of alkoxycyclohexanol trimethylsilyl ethers and alkoxycyclohexyl trimethylsilanes, using deuterium labeling
Computerized method of interpreting low resolution mass spectra in organic chemical analysis, describing inference maker program applications and results
Discussion of the modification of the DENDRAL computer program to extend the program to cyclic structures which exceed numerically the linear molecules of a given composition. IR, NMR and mass spectroscopy is used to develop a method for identification of each of the 27 possible ketones (exclusive of 5 cyclopropanones) of composition C6H10O.
Aliphatic ethers low resolution mass spectra interpretation using computer program heuristic DENDRAL
Isomeric 1-phenylheptenes mass spectra, investigating electron impact induced rearrangements of double bond
Electron impact induced fragmentation of androstane using deuterium labeling
Dialkyl ketone ion in double McLafferty rearrangement, applying ion cyclotron resonance to structural study
DENDRAL program used to construct all possible acyclic structural isomers of C, H, N and O
Computer program to decide structure for aliphatic ketone from low resolution mass spectrum using DENDRAL algorithm
Ion structure of keto and enol and McLafferty rearrangements determined by ion cyclotron resonance spectroscopy
Mass spectra of 1,2-cyclohexane oxide and three deuterium labeled analogs