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1Author    Z. NaturforschRequires cookie*
 Title    Organosubstituierte  
 Abstract    l,6,2,5-Azoniathiasilaboratabicyc!o[3.3.0]oct-3-ene -Herstellung und Kristallstruktur [1] O rg anosubstituted 1,6,2,5-A zoniathiasilaboratabicyclo[3.3.0]oct-3-enes -P rep aratio n and Crystal Structure [1] R oland K östera *, G ü n te r Seidel3, B ernd W rackm eyerb, R oland B oesec The heterocycles MeNSi(Me2)C(R3)=C (Et)B Et [R3 = Me: A; R3 = C(M e)=CH 2: B] react with 2-aminoethanet'nioi (i) by elimination of M eNH 2 to give the monocyclic H N CH 2CH2SSi(Me2)C (R)=C (Et)B Et [R = Me: 3a; R = C(M e)=CH 2: 3b] and the ther-mically more stable bicyclic compounds H NSi(Me2)C (R)=C (E t)B (E t)SC H 2CH 2 [R = Me: 4a; R = C(M e)=CH2: 4b], 4a crystallizes in the monoclinic space ^ ro u p P2i/c [lattice con­ stants (at 120 K) a = 9.3239(10), b = 8.9225(11), c = 17.3958(23) A; ß = 92.207(9)°] with a folded bicyclic ring system. c/s-ClB(Et)C=C(M e)Si(M e2)Cl (C) and Na2-lB E t3 (prepared from 1 and N aH BEt3) form by elimination of M eNH2 preferentially 3 a and minor amounts of 4a. A reacts with o-aminothiophenol (2) via H NSi(Me2)C(M e)=C (Et)B (Et)S(oC 6H 4) (5) to NSi(Me2)C(M e)=C(Et)BS(oC6H 4) (6) and the products 7-10. 
  Reference    Z. Naturforsch. 50b, 959—968 (1995); eingegangen am 24. November 1994 
  Published    1995 
  Keywords    2, 5-Dihydro-l, 2, 5-azasilaboroles, Am inothioalkanes(arenes), Bicyclic Heterocycles, Crystal Structure 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0959.pdf 
 Identifier    ZNB-1995-50b-0959 
 Volume    50 
2Author    KenjiM. Atsui, H. Iroyuki, S. Hinta, T. Adahiko, K. Ajiwara, A. Kikazu, H. Atan AkRequires cookie*
 Title    Effect of Modification of Arginine Residues on the Activity of Soybean Lipoxygenase-1  
 Abstract    Arginine residues of soybean lipoxygenase-1 was modified with an arginine-directed chemical modifier, 2,3-butanedione. Although inactivation was not visible if the enzyme reac­ tion was monitored under the standard assay condition (83.3 |.im linoleic acid dispersed in 200 mM sodium borate, pH 9.0), rapid inactivation was observed with 5 mM sodium borate, pH 8.0. The inactivation was protected by the addition of a substrate, linoleic acid, in the modification mixture. Kinetic analyses indicated that one arginine residue accounted for the inactivation. Enzymological analyses showed that the modification narrowed the pH-activity profile of L-l and made L-l sensitive to salt concentration of the assay solution. Strong inactivation by modification was found at low salt concentration and low pH. This was not due to a physical change of the linoleic acid. On the other hand, product specificity of L-l was not altered after modification. Taken together, the modified arginine residue(s) was thought to be not essential to the catalysis but have an important role in supporting an ideal electrostatic interaction within L-l and/or between L-l and a substrate even in sub-optimal reaction conditions. 
  Reference    Z. Naturforsch. 50c, 37—4 (1995); received September 26/November 8 1994 
  Published    1995 
  Keywords    Arginine, 2, 3-Butanedione, Modification, Soybean Lipoxygenase-1 
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 TEI-XML for    default:Reihe_C/50/ZNC-1995-50c-0037.pdf 
 Identifier    ZNC-1995-50c-0037 
 Volume    50 
3Author    E. K. Yudin, K. V. Domasevitch, E. B. RusanovRequires cookie*
 Title    Crystal and Molecular Structure of Isonitrosomalonodiamido- (2,2-dipyridyl)copper(II), Chloride Monohydrate [Cu(Dipy){ONC(CONH2)2}Cl] H20  
 Abstract    The crystal and molecular structure of the complex [Cu(Dipy){NDA}Cl] • H 20 , where (NDA) = {ONC(CONH2)2}~ anion (space group P I, triclinic, with a = 7.834(1), b = 9.923(1), c = 9.952(1)A, a = 93.60(1), ß = 93.65(1), y = 92.72(1)°, Z = 2) has been determined from X-ray diffraction data. The structure was refined to R -0.029 for 2243 reflections with I>3ct(I). The coordination polyhedron of Cu2+ can be described as a distorted square pyra­ mid with a chlorine atom in the apex, and with the central atom situated 0.258(3) A above the base of the pyramid towards the chlorine atom. The complicated system of hydrogen bonding involving the water of crystallization connects copper complex units in to the chains in the c direction. 
  Reference    Z. Naturforsch. 50b, 864—866 (1995); received O ctober 17 1994 
  Published    1995 
  Keywords    Copper(II), Oximes, 2, 2-Dipyridyl, X-Ray Spectra 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0864.pdf 
 Identifier    ZNB-1995-50b-0864 
 Volume    50