Conrad_Laar

Conrad Laar

Conrad Laar

German chemist (1853–1929)

Conrad Peter Laar (22 March 1853 – 11 February 1929) was a German chemist.[1] He coined the expression tautomerism in 1885.[2] He also observed the double bond rule in 1885, stating elements with a principal quantum number greater than 2 for their valence electrons (period 3 elements and higher) tend not to form multiple bonds.[3]

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References

  1. [1]
    Pfeiffer (1929). "Conrad Laar (1853 - 1929)". Angewandte Chemie. 42 (49): 1117. Bibcode:1929AngCh..42.1117P. doi:10.1002/ange.19290424902.
  2. [2]
    Laar, Conrad (1885). "Ueber die Möglichkeit mehrerer Strukturformeln für dieselbe chemische Verbindung". Berichte der Deutschen Chemischen Gesellschaft. 18: 648–657. doi:10.1002/cber.188501801141.
  3. [3]
    Bernard E. Hoogenboom (1998). "A History of the Double-Bond Rule". ACS Publications. 75 (5): 1. Bibcode:1998JChEd..75..596H. doi:10.1021/ed075p596.
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