(S(P),S(P))-(-)-(E)-1,2-Bis(methyl-phenyl-phosphino-yl)ethene

Area of Science:

• Organophosphorus Chemistry
• Crystallography
• Stereochemistry

Background:

• Organophosphorus compounds with stereogenic phosphorus atoms are of significant interest.
• Previous studies suggested a distorted s-cis conformation in related molecules based on reaction outcomes.
• Understanding molecular conformation is key to predicting chemical reactivity.

Purpose of the Study:

• To confirm the proposed distorted s-cis conformation of the O=P-C=C moiety in the title compound.
• To provide definitive structural evidence through crystal structure analysis.
• To elucidate the stereochemical properties of this specific organophosphorus molecule.

Main Methods:

• Single-crystal X-ray diffraction analysis was employed.
• The crystal structure of the title compound, C(16)H(18)O(2)P(2), was determined.
• The conformation of the O=P-C=C units was analyzed in detail.

Main Results:

• The crystal structure analysis confirmed a distorted s-cis conformation for each O=P-C=C moiety.
• Two crystallographically independent molecules were identified in the asymmetric unit.
• The molecular geometry and stereochemistry were precisely determined.

Conclusions:

• The crystal structure provides direct evidence for the distorted s-cis conformation.
• This structural confirmation validates previous stereochemical inferences from cycloaddition reactions.
• The findings contribute to a deeper understanding of stereoisomerism in organophosphorus chemistry.