CARBON-PHOSPHORUS HETEROCYCLES. STRUCTURAL ANALYSIS OF 1,2,3,4-TETRAHYDRO-1,4-DIMETHYL-1-PHENYL-PHOSPHINOLINIUM HEXAFLUOROPHOSPHATE AND 1,2,3,4-TETRAHYDRO-1-ETHYL-4-METHYL-1-PHENYLPHOS-PHINOLINIUM HEXAFLUOROPHOSPHATE. A NOVEL COCRYSTALLIZATION OF STEREOISOMERS OF THE FORMER

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