"Unhindered primary alkyl substrates always react in a bimolecular way and almost always give predominantly substitution products, except when sterically hindered strong bases, such as potassium tert-butoxide, are employed. In these cases, the SN2 pathway is slowed down sufficiently for steric reasons to allow the E2 mechanism to take over. Another way of reducing substitution is to introduce branching. However, even in these cases, good nucleophiles still furnish predominantly substitution products. Only strong bases, such as alkoxides, RO-, or amides, R2N-, tend to react by elimination."
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K. Peter C. Vollhardt, Neil E. Schore (2011) Organic chemistry : structure and function 6th ed. Chapter 7. Further Reactions of Haloalkanes
https://en.wikiquote.org/wiki/Nucleophilic_substitution
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Nucleophilic substitution
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