How was Georg Wittig awarded the Noble Prize?

Name: Georg Wittig. 
Country: Germany.
Date of Birth: 16 June 1897.
Date of Death: 26 August 1987.
The subject of Study: Wittig reaction, Organic phosphorus compound.
Noble Prize Year: Nobel Prize for Chemistry in 1979 for their development of the use of boron- and phosphorus-containing compounds, respectively, into important reagents in organic synthesis.