ABSTRACT
The title pyrrole derivative compound, C(12)H(17)NO(4), was synthesized from methyl 3-oxopenta-noate by a Knorr-type reaction and contains a pyrrole ring to which two diagonal alk-oxy-carbonyl groups and two diagonal alkyl substituents are attached. The methyl-carbonyl and ethyl-carbonyl substituents are approximately co-planar with the pyrrole ring, making dihedral angles of 5.64â (2) and 3.44â (1)°, respectively. In the crystal, adjacent mol-ecules are assembled by pairs of N-Hâ¯O hydrogen bonds into dimers in a head-to-head mode.
ABSTRACT
The title pyrrole derivative, C(12)H(17)NO(4), consists of a pyrrole ring with two diagonally attached meth-oxy-carbonyl groups and two diagonally attached ethyl groups. The two carbonyl groups are approximately in the same plane as the pyrrole ring, making dihedral angles of 3.50â (19) and 6.70â (19)°. In the crystal, adjacent mol-ecules are assembled into dimers in a head-to-head mode by pairs of inter-molecular N-Hâ¯O hydrogen bonds.
ABSTRACT
Sampling sites were installed in Damao Banner, Siziwang Banner, and Sunite Right Banner of Inner Mongolia, which represented lightly, moderately, and heavily degraded desert steppes, respectively, and surface (0-20 cm) soil samples were collected to analyze the quantitative characteristics and seasonal dynamics of soil organic carbon (SOC) and microbial biomass carbon (MBC) in these steppes. The SOC and MBC contents decreased with the increasing degradation degree of desert steppe. The total amount of soil culturable microbes in lightly and moderately degraded desert steppes was higher than that in heavily degraded desert steppe, except in summer 2006, and the MBC content and the quantity of soil culturable microbes were higher in summer and autumn than in spring and winter. Correlation analysis showed that there was a significant positive correlation between SOC and MBC (P < 0.01), suggesting that both SOC and MBC could be used as the sensitive indicators to evaluate the degradation degree of desert steppe.
