(Chloromethylene)triphenylphosphorane

(Chloromethylene)triphenylphosphorane
Identifiers
CAS Number	29949-92-6;
3D model (JSmol)	Interactive image;
ChemSpider	366640;
PubChem CID	414080;
	InChI InChI=1S/C19H16ClP/c20-16-21(17-10-4-1-5-11-17,18-12-6-2-7-13-18)19-14-8-3-9-15-19/h1-16H Key: KIZBYQRDCHVQID-UHFFFAOYSA-N;
	SMILES C1=CC=C(C=C1)P(=CCl)(C2=CC=CC=C2)C3=CC=CC=C3;
Properties
Chemical formula	C19H16ClP
Molar mass	310.76 g·mol−1
Appearance	white solid
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

(Chloromethylene)triphenylphosphorane is the organophosphorus compound with he formula Ph₃P=CHCl (Ph = phenyl). It is a white solid but is usually generated and used in situ as a reagent in organic synthesis. It is structurally and chemically related to methylenetriphenylphosphorane.

The reagent is prepared from the chloromethylphosphonium salt [Ph₃PCH₂Cl]Cl by treatment with strong base. The phosphonium compound is generated by treatment of triphenylphosphine with chloroiodomethane.[1]

(Chloromethylene)triphenylphosphorane converts aldehydes to vinyl chlorides:

RCHO + Ph₃P=CHCl → RCH=CHCl + Ph₃PO

These vinyl chlorides undergo dehydrochlorination to give alkynes:[2]

RCH=CHCl + NaN(SiMe₃)₂ → RC≡CH + NaCl + HN(SiMe₃)₂

References

Appel, Rolf; Morbach, Wolfgang (1977). "(Chloromethylene)triphenylphosphorane". Angewandte Chemie International Edition in English. 16 (3): 180–181. doi:10.1002/anie.197701801.
Marth, Charles F. (2001). "Chloromethyltriphenylphosphonium Chloride". Encyclopedia of Reagents for Organic Synthesis. doi:10.1002/047084289X.rc134. ISBN 0471936235.

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[1] Appel, Rolf; Morbach, Wolfgang (1977). "(Chloromethylene)triphenylphosphorane". Angewandte Chemie International Edition in English. 16 (3): 180–181. doi:10.1002/anie.197701801.

[2] Marth, Charles F. (2001). "Chloromethyltriphenylphosphonium Chloride". Encyclopedia of Reagents for Organic Synthesis. doi:10.1002/047084289X.rc134. ISBN 0471936235.