TY - JOUR
AU - SCHNEIDERMAN, HOWARD A.
AB - © Nature Publishing Group 1956 No. 4521 June 23, 1956 NATURE 1169 can be interpreted ; but their limited accuracy does projections and by the decrease in intensity of the not in our opinion justify carrying the analysis characteristic bands in the electronic spectra. With 1 2 methyl substituents at either R or. R , but not further at present. The estimated or observed values 7 5 simultaneously at R or R , the steric retardations of ( + !iliEA/- !iliER) could obviously be used, are relatively small ( + titiEA < 2 k.cal./mol.), since however, to calculate the relative rates of formation only methyl-hydrogen interference will occur. On of other hindered conjugated systems from their the other hand, with methyl substituents at R or electronic spectra, or vice versa. 2 7 6 R and simultaneously at R or R , as in the last two Braude, Quart . R ev. Chem. Soc., 4, 404 (1950). examples in Table 3, the steric retardations are large ' Braudc, Experientia, 11, 457 (1955). ( + titiEA > 4 k.cal./mol.), since in these cases inter­ ' Pu!Imau and Pullman, "Theorie Electroniquc de la Chimie Organique" ference between two methyl groups is involved. 
TI - Spiracular Control of Discontinuous Respiration in Insects
JF - Nature
DO - 10.1038/1771169a0
DA - 1956-06-23
UR - https://www.deepdyve.com/lp/springer-journals/spiracular-control-of-discontinuous-respiration-in-insects-N0Yn0Srdxx
SP - 1169
EP - 1171
VL - 177
IS - 4521
DP - DeepDyve
ER -