ABSTRACT
Catalytic sequential hydroboration of decaborane for the synthesis of poly(organodecaborane), with decaborane in the mainchain, is reported for the first time. Under a platinum catalytic system, poly(6-hexenyldecaborane) and poly(6-norbornenyldecaborane) are obtained with well-defined structures and a moderate yield. Thermogravimetric analysis demonstrates that the char yields are 73% and 82%, respectively.
ABSTRACT
In this paper, the community types of broadleaved-Korean pine mixed forest in Northeast China were identified, and the groups of tree relationship were established based on TWINSPAN. The species diversities at 4 locations in Northeast China, i.e., Changbai Mountain, Datudingzi Mountian, Pingding Mountian and Fenglin Nature Reserve, were compared. The results showed that 264 species belonging to 147 genera in 64 families were recorded in 24 plots, and the 24 plots were identified into 7 community types and 3 groups. The 33 tree species were divided into 8 groups according to their relations. Herbaceous plants possessed the greatest species richness and diversity, followed by shrubs and trees. At the 4 locations, Changbai Mountain owned the highest average species richness of 63. The diversities of tree layer and shrub layer in Changbai Mountain and Datudingzi Mountain were higher than those in Pingding Mountain and Fenglin Nature Reserve. The diversity of herb layer in Fenglin Nature Reserve was 2. 83, being higher than that at other 3 locations. The shrub layer in Pingding Mountain and the herb layer in Changbai Mountain had the lowest evenness of 0.71 and 0.80.
