Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels. 131-53-3, Name is Dioxybenzone, molecular formula is C14H12O4. In an article, author is Krieck, Sven,once mentioned of 131-53-3, HPLC of Formula: C14H12O4.
Synthesis and catalytic activity of tridentate N-(2-pyridylethyl)-substituted bulky amidinates of calcium and strontium
Metalation of the formamidine Dipp-N?C(H)-N(H)-C2H4-Py (1a) and benzamidine Dipp-N?C(Ph)-N(H)-C2H4-Py (1b) with [(thf)(2)M{N(SiMe3)(2)}(2)] (M = Ca, Sr) yields the corresponding homoleptic complexes [M{Dipp-N?C(R)-N-C2H4-Py}(2)] (M/R = Ca/H (2a), Ca/Ph (2b), and Sr/Ph (3b)) regardless of the applied stoichiometry. Only during calciation of Dipp-N?C(H)-N(H)-C2H4-Py (1a), the heteroleptic intermediate [{(Me3Si)(2)N}Ca{Dipp-N?C(R)-N-C2H4-Py}](2) (2a) has been observed. The formamidinate complex of strontium crystallizes as a tmeda adduct of the type [(tmeda)Sr{Dipp-N?C(H)-N-C2H4-Py}(2)] (3a). Metalation of the pivalamidine Dipp-N?C(tBu)-N(H)-C2H4-Py (1c) leads to the formation of heteroleptic mononuclear [{(Me3Si)(2)N}M{Dipp-N?C(tBu)-N(H)-C2H4-Py}] (M = Ca (2c) and Sr (3c)) with a side-on bonding of the Dipp group to the alkaline earth metals. Calciation of chiral Dipp-N?C(tBu)-N(H)-CH2CH(Me)-Py (R)-1d and (S)-1d with [(thf)(2)Ca{N(SiMe3)(2)}(2)] yields the homoleptic complexes [Ca{Dipp-N?C(tBu)-N-CH2CH(Me)-Py}(2)] with the enantiomeric forms (R,R)-2d and (S,S)-2d regardless of the applied stoichiometry. The complexes 2c and 2d catalyze the intramolecular hydroamination of the aminoalkene 2,2-diphenylpent-4-enylamine yielding 2-methyl-4,4-diphenylpyrrolidine but the stereochemistry cannot be influenced by the chiral compounds (R,R)-2d and (S,S)-2d.
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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis¡ªI. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
,Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis