Synthesis of 4-azatricyclo[4,4,0,03,8]decan-5-one - A lactam with a non-planar cis-amide group and related compounds

M. Tichý; E. Hamšíková; K. Bláha

doi:10.1135/cccc19761935

Synthesis of 4-azatricyclo[4,4,0,03,8]decan-5-one - A lactam with a non-planar cis-amide group and related compounds

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19761935 ◽

1976 ◽

Vol 41 (7) ◽

pp. 1935-1943 ◽

Cited By ~ 4

Author(s):

M. Tichý ◽

E. Hamšíková ◽

K. Bláha

Keyword(s):

Amide Group ◽

Related Compounds

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The methylenic sequence conformation in a series of isoelectronic molecules

Canadian Journal of Chemistry ◽

10.1139/v88-059 ◽

1988 ◽

Vol 66 (2) ◽

pp. 341-347 ◽

Cited By ~ 6

Author(s):

Suzanne Deguire ◽

François Brisse

Keyword(s):

Solid State Nmr ◽

Weighted Least Squares ◽

Direct Methods ◽

Aromatic Polyamide ◽

Amide Group ◽

Trans Conformation ◽

A Value ◽

Isoelectronic Series ◽

Isoelectronic Molecules ◽

Related Compounds

The crystal structures of 1,4-dibenzoylbutane, 2DBC, and ethyleneglycol dithiobenzoate, 2DBS, have been solved by direct methods in order to follow the evolution of the geometry and the conformation of the Y—CH2—CH2—Y sequence in the isoelectronic series of C6H5—CO—Y—CH2—CH2—Y—CO—C6H5 where Y = CH2, NH, O, and S. 2DBC is monoclinic, a = 7.750(4), b = 21.287(6), c = 8.905(2) Å, β = 100.55(3)°, Z = 4. 2DBS is also monoclinic, with a = 5.702(3), b = 16.171(15), c = 8.001(4) Å, β = 98.79(4)°, and Z = 2. Both compounds belong to the P21/n space group. The weighted least-squares refinements converged to Rw = 0.049 (2DBC) and 0.043 (2DBS). The conformation of the methylenic sequence is all-trans (2DBC) and g+tg− for 2DBS (t = trans, g = gauche). The ir spectra have absorptions at 1467, 1308, and 931 cm−1 (2DBC) and at 1408, 1239, and 727 cm−1 (2DBS), respectively, characteristic of the trans conformation of the Y—CH2—CH2—Y sequence. The 13C CP/MAS solid-state nmr spectra of these and other related compounds have been recorded. It is, in turn, possible to propose that the τ torsion angle between the amide group and the methylenic sequence, has a value of 85° in the aromatic polyamide, Nylon 2T.

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Effect of Non-Peptide and Non-Protein Nitrogen Compounds for the Determination of Protein Content by near Infrared Spectroscopy

Journal of Near Infrared Spectroscopy ◽

10.1255/jnirs.41 ◽

1994 ◽

Vol 2 (3) ◽

pp. 145-151 ◽

Cited By ~ 9

Author(s):

Hiromi Yamashita ◽

Hitoshi Takamura ◽

Teruyoshi Matoba

Keyword(s):

Protein Content ◽

Near Infrared ◽

Accurate Determination ◽

Nir Spectroscopy ◽

Amide Group ◽

Nitrogen Compounds ◽

Protein Nitrogen ◽

Peptide Bonds ◽

Related Compounds

The significance of the absorption at 2170 nm due to peptide bonds for the determination of protein content by near infrared (NIR) spectroscopy was evaluated by comparing it with absorptions due to other nitrogens (non-peptide nitrogens in protein and non-protein nitrogens). The amide group (asparagine and glutamine), guanido group (arginine), imidazole group (histidine) and amino group (lysine) in proteins did not exhibit absorption at 2170 nm. The absorptions of nucleic acid related compounds also were not observed at 2170 nm. These results suggest that a wavelength of 2170 nm is suitable for the accurate determination of protein content in foods.

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