The phrase "were allowed to react" is correct and commonly used in written English.
This phrase is typically used to describe a situation where someone was given permission or the opportunity to respond or behave in a certain way. Example: During the meeting, only the board members were allowed to react to the proposal. This means that only the board members were given the authority to share their thoughts or opinions about the proposal during the meeting.
In their experiments antineutrinos emitted in a nuclear reactor were allowed to react with protons to produce neutrons and positrons.
For Pyruvate binding assay, 50 μg of purified His tagged-LDHA and pre-equilibrated Ni-NTA beads (Amersham Pharmacia Biotech, Little Chalfont, UK) were allowed to react for 30 min by rotating at 4 °C.
In the second step, the hydroxyl groups of N,N-dimethylethylethanolamine (DMEA) or 4-dimethylamino-1-butanol (DMAB) were allowed to react in toluene with isocyanate groups bound on surface.
In an effort to identify the nature of possible interactions between polyhedral borane anions and proteins, three polyhedral borane anions, [B20H18]2−, [B20H17OH]4−, and [B20H17SH]4−, were allowed to react with either bovine or human serum albumin.
A variety of chalcone derivatives were allowed to react with methyl thioglycolate under optimized conditions, in the presence of a bifunctional quinine derived sterically encumbered squaramide organocatalyst, giving rise to excellent stereoselectivities, up to 99% ee.
A dispersion of MWCNT modified with monomeric thiophene derivative (MWCNT-thio) and the monomer 3-hexylthiophene (3HT) were allowed to react by in-situ oxidative polymerization to prepare a P3HTMWCNT covalent hybrid.
The mixed solutions were allowed to react for 12 h at room temperature in dark.
Compounds or reference were allowed to react with FRAP reagent in the dark for 30 min.
Second, the remaining acyl chloride groups of poly were allowed to react with the hydroxyl groups of hydroxylated graphene nanoplatelets.
Alkyne tosylate and a [18F]fluoride-Kryptofix complex were allowed to react in DMSO for 5 min at 80 °C.
This was followed by a coupling step where molecules with pyrene groups were allowed to react with amines.
