The titled dipolar hybrids bearing a central quinoxaline-fused dibenzosuberene optoelectronic unit with functional C5 and C8 appendages and spiro-fluorene junction act as fluorescent bipolar OLED chameleons. The emission colors can be tuned from blue, green, yellow, to red with operation brightness of 205, 1268, 1542, and 1102 cd/m2, respectively, at 20 mA/cm2.

The titled hybrid (Q-H) works as a clippable optoelectronic unit. Q-spacer-Q systems function as efficient orange emitters reaching EL intensities (L) of up to 6840 cd m-2 with etaext of 0.77% and operation efficiencies of 1.60 cd A-1 and 0.8 lm W-1. Notably, Q-An acts as a (bluish) green emitter, reaching L of 12347 cd m-2 with similar operational efficiency.

Diethylene glycol dimethyl ether, diglyme, and 1,2-bis­(2-methoxyethoxy)­ethane, triglyme, are found to be suitable and safe alternate solvents to DMSO for the reduction of methanesulfonate in sodium borohydride. Addition of anhydrous lithium chloride led to the complete reduction of methanesulfonate esters to the corresponding alkanes in the presence of sodium borohydride in these solvents (diglyme and triglyme). This protocol is useful in the preparation of 1,2,3-triacetyl-5-deoxy-d-ribofuranoside, 7, a key intermediate of Capecitabine, 1, on the commercial scale.