... in ”Steric Effects in Organic Chemistry,” M. S. Newman, Ed., John Wiley and Sons, Inc., New York, NY, 1956, p 592. ... Chem. ... carbon-hydrogen insertion rate ratios for methylene and carbomethoxy carbene differ by a factor of only 2.4.17 (17) W. von E. Doering and LH Knox, J. Am. ...