( ( Click chemistry ) ( ( ( uses ( ( ( high-yielding ( and ( practical reactions ) ) ) ( -LRB- ( ( click reactions ) -RRB- ) ) ) ( that ( need ( no ( ( , ( or ( minimal , ) ) ) purification ) ) ) ) ) ) ( -LRB- ( ( ( i.e. ( , ( approximately ( no by-products ) ) ) ) ( are produced ) ) -RRB- ) ) ) . ) )
(ROOT (S (NP (JJ Click) (NN chemistry)) (VP (VBZ uses) (NP (NP (JJ high-yielding) (CC and) (JJ practical) (NNS reactions)) (PRN (-LRB- -LRB-) (NP (NN click) (NNS reactions)) (-RRB- -RRB-)) (SBAR (WHNP (WDT that)) (S (VP (VBP need) (NP (DT no) (PRN (, ,) (CC or) (NP (JJ minimal)) (, ,)) (NN purification)))))) (PRN (-LRB- -LRB-) (S (NP (JJ i.e.) (, ,) (RB approximately) (DT no) (NNS by-products)) (VP (VBP are) (VP (VBN produced)))) (-RRB- -RRB-))) (. .)))
Click chemistry uses high-yielding and practical reactions (click reactions) that need no, or minimal, purification (i.e., approximately no by-products are produced).
(ROOT (S (NP (NP (DT The) (NN amount)) (PP (IN of) (NP (NP (NN product)) (SBAR (WHNP (WDT that)) (S (VP (MD may) (VP (VB be) (VP (VBN produced) (PP (IN by) (NP (DT a) (NN reaction))) (PP (IN under) (NP (VBN specified) (NNS conditions))))))))))) (VP (VBZ is) (VP (VBN called) (NP (JJ theoretical) (NN yield)))) (. .)))
The amount of product that may be produced by a reaction under specified conditions is called theoretical yield.