(1) The existence of an unknown acid in the volatile part from the wood of Libocedrus formosana, Florin, or “Shônan-Boku” is reported. (2) Shonanic acid is an unsaturated monobasic acid with a monocyclic structure of the formula C10H14O2, melting at 40–41°. Its amide melts at 116-117° and the anilide at 111-112°. (3) Shonanic acid can be converted into tetrahydroshonanic acid by absorption of four atoms of hydrogen when reduced catalytically, while it absorbs only two atoms of bromine, and when reduced with sodium and ethyl alcohol an unsaturated acid, viz. dihydroshonanic acid (C10H16O2), is obtained. These experimental facts together with the fact that the molecular refraction of shonanic acid exhibits an eminent exaltation lead to the conclusion that conjugated double bonds exist in its molecule. (4) Though tetrahydroshonanic amide melts at 144°, it was proved that the acid is quite different from dihydro-a-campholenic acid (C10H18O2, amide m.p. 144°). (5) Shonanic acid isomerizes to isoshonanic acid by the action of hot strong alkali solution. Iso-acid melts at 45° and gives an amide melting at 107–108°. (6) The isomerisation of shonanic acid to isoshonanic acid is accompanied by the elevation of the boiling point to the extent of 13°C. This phenomenon may probably be due to the migration of semicyclic double bond into the ring system of the acid, which must be ascertained by further investigations.
(1) In order to verify the postulate that the third band is due to a pair or pairs of negative radicals co-ordinated in trans-positions to each other, extinction coefficients of [Co(NO2)6]Na3, [Co(NH3)4Cl NO2]Cl, [Co(NH3)4(NO2)2(6)(1)]Cl, [Co(NH3)2(NO2)4]NH4, etc. were measured. (2) Aqueous solutions of [Co(NO2)6]Na3 and [Co(NH3)4Cl NO2]C1 were proved to have the third bands as will be predicted from the postulate. (3) Regularities among the frequencies of the first, the second, and the third band were pointed out, viz., for the cobalt complex salts, which show the third band, ν3–ν2 and ν2–ν1 are 33×1013 and 18×1013, whereas for the pentammine and the tetrammine cobaltic salts, ν2–ν1 is 27×1013 and 24∼26×1013 respectively.
(1) The static friction coefficients have been measured when the monomolecular films of some fatty acids, etc. are deposited on glass surface. (2) The static friction coefficients have been measured on palmitic acid and oleic acid, when the film thickness increase from one to several molecular layers. (3) The friction coefficient of the monomolecular film is about one tenth of that of the clean glass surface. The value shows no further reduction by the increase of the thickness of film. (4) Regular arrangement of oil molecules in the film gives lower friction coefficient than the irregular one.