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4,4'-Biphenyldiboronic acid 3-ISOPROPYLPHENYLBORONIC ACID 3-ETHYLPHENYLBORONIC ACID 9,9-Dimethyl-9H-fluoren-2-yl-boronic acid 4-Biphenylboronic acid 9,9-Dihexylfluorene-2,7-bis(trimethyleneborate) (9,9-Dimethyl-9H-fluoren-2,7-diyl)diboronic acid 9,9-Diethylfluorene-2-boronicacid 3,4-Dimethylphenylboronic acid 9 9-DIHEXYLFLUORENE-2 7-DIBORONIC ACID